Antibody constructs for CDH19 and CD3

ABSTRACT

The present invention provides to a bispecific antibody construct comprising a first human binding domain which binds to human CDH19 on the surface of a target cell and a second binding domain which binds to human CD3 on the surface of a T cell. Moreover, the invention provides a polynucleotide encoding the antibody construct, a vector comprising said polynucleotide and a host cell transformed or transfected with said polynucleotide or vector. Furthermore, the invention provides a process for the production of the antibody construct of the invention, a medical use of said antibody construct and a kit comprising said antibody construct.

The present invention relates to a bispecific antibody construct comprising a first human binding domain which binds to human CDH19 on the surface of a target cell and a second binding domain which binds to human CD3 on the surface of a T cell. Moreover, the invention provides a polynucleotide encoding the antibody construct, a vector comprising said polynucleotide and a host cell transformed or transfected with said polynucleotide or vector. Furthermore, the invention provides a process for the production of the antibody construct of the invention, a medical use of said antibody construct and a kit comprising said antibody construct.

Melanoma is a skin cancer that is caused by the oncogenic transformation of melanocytes, which are pigment producing skin cells. As of 2009, Melanoma had a prevalence of more than 870,000 cases in the US alone (US National Institutes of Health). Each year, over 75,000 new cases of melanoma are diagnosed in the US, and approximately 25% of patients have advanced disease at the time of diagnosis. Despite the fact that cases of primary melanoma can be cured by surgery if they are detected early enough, melanoma is the leading cause of death from skin disease in the US, responsible for about 10,000 deaths per year in the US. Once the disease has spread and became metastatic, the prognosis is poor, with a 5 year relative survival of 15%.

There are four basic types of melanomas. Three types are found in the top layers of the skin and the fourth one is invasive and has penetrated deeper into the skin and may have spread to other areas of the body.

Superficial spreading melanoma is the most common type of melanoma which accounts for about 70% of all cases. It grows along the top layer of the skin for a fairly long time before penetrating more deeply. It first appears as a flat or slightly raised discolored patch that has irregular borders and may be somewhat asymmetrical in form. The color varies, and you may see areas of tan, brown, black, red, blue or white. This type of melanoma can occur in a previously benign mole and is found most often in young people.

Lentigo maligna is similar to the superficial spreading type, as it also remains close to the skin surface for quite a while, and usually appears as a flat or mildly elevated mottled tan, brown or dark brown discoloration. It is found most often in the elderly. When this cancer becomes invasive, it is referred to as lentigo maligna melanoma.

Acral lentiginous melanoma also spreads superficially before penetrating more deeply. It is quite different from the others, though, as it usually appears as a black or brown discoloration under the nails or on the soles of the feet or palms of the hands. This type of melanoma is sometimes found on dark-skinned people, and can often advance more quickly than superficial spreading melanoma and lentigo maligna.

Nodular melanoma is usually invasive at the time it is first diagnosed. The malignancy is recognized when it becomes a bump. It is usually black, but occasionally is blue, gray, white, brown, tan, red or skin tone. This is the most aggressive of the melanomas, and is found in 10 to 15 percent of cases.

Common treatments for metastatic melanoma include chemotherapy, targeted therapies for eligible patients (e.g. BRAF inhibitor treatment for patients with BRAF mutations) and immunotherapy. Metastatic melanoma is a tumor type where immunotherapy has been demonstrated to not only slow disease progression, but to lead to cures in late stage patients. Interleukin-2 was approved for the use in metastatic melanoma in 1998, and in 2011 an antibody targeting CTLA4, a member of a new generation of immune checkpoint inhibitors, gained approval by the FDA.

CDH19 is a type II cadherin transmembrane protein of unknown function. The human gene was cloned in 2000 based on its sequence similarity to CDH7 (Kools, P. et al. Genomics. 2000). Expressed Sequence Tags (ESTs) for CDH19 were isolated from melanocyte cDNA libraries, indicating that expression of CDH19 may be limited to cells of neural crest origin (Kools, P. et al. Genomics. 2000). In support of this notion, rat CDH19 was found to be expressed primarily in nerve ganglia and in Schwann cells during rat embryonic development (Takahashi, M. and Osumi, O. Devl Dynamics. 2005).

Diagnostic antibodies detecting CDH19 in Western Blot, immunohistochemitstry or flow cytometry are known in the art and commercially available. Those antibodies comprise poly- and monoclonal antibodies generated in animal hosts.

In an internal analysis of proprietary mRNA expression data it has been surprisingly found that CDH19 expression is elevated in both primary and metastatic melanoma tumors compared to normal, untransformed tissues. Internal analysis also confirmed that expression of CDH19 in normal tissues is limited to neural crest derived peripheral nerve ganglia and nerve fibers. The differential CDH19 expression in normal and tumor tissues makes this protein attractive for cell-surface targeting therapeutics. Although CDH19 was discussed as one marker as part of long lists of markers associated with some cancer types (see e.g. WO 2009/055937) or Parkinson's disease (see e.g. WO 2005/067391) CDH19 was never discussed as a prognostic marker or a drug target in connection with melanoma tumors.

As there is still a need for having available further options for the treatment of melanoma, there are provided herewith means and methods for the solution of this problem in the form of a bispecific antibody construct with one binding domain directed to CDH19 and with a second binding domain directed to CD3 on T cells.

Thus, in a first aspect the present invention provides a bispecific antibody construct comprising a first human binding domain which binds to human CDH19 on the surface of a target cell and a second binding domain which binds to human CD3 on the surface of a T cell, wherein the first binding domain comprises a VH region comprising CDR-H1, CDR-H2 and CDR-H3 and a VL region comprising CDR-L1, CDR-L2 and CDR-L3 selected from the group consisting of:

-   (a) CDR-H1 as depicted in SEQ ID NO: 14, CDR-H2 as depicted in SEQ     ID NO: 15, CDR-H3 as depicted in SEQ ID NO: 16, CDR-L1 as depicted     in SEQ ID NO: 17, CDR-L2 as depicted in SEQ ID NO: 18 and CDR-L3 as     depicted in SEQ ID NO: 19;     -   CDR-H1 as depicted in SEQ ID NO: 27, CDR-H2 as depicted in SEQ         ID NO: 28, CDR-H3 as depicted in SEQ ID NO: 29, CDR-L1 as         depicted in SEQ ID NO: 30, CDR-L2 as depicted in SEQ ID NO: 31         and CDR-L3 as depicted in SEQ ID NO: 32;     -   CDR-H1 as depicted in SEQ ID NO: 40, CDR-H2 as depicted in SEQ         ID NO: 41, CDR-H3 as depicted in SEQ ID NO: 42, CDR-L1 as         depicted in SEQ ID NO: 43, CDR-L2 as depicted in SEQ ID NO: 44         and CDR-L3 as depicted in SEQ ID NO: 45;     -   CDR-H1 as depicted in SEQ ID NO: 53, CDR-H2 as depicted in SEQ         ID NO: 54, CDR-H3 as depicted in SEQ ID NO: 55, CDR-L1 as         depicted in SEQ ID NO: 56, CDR-L2 as depicted in SEQ ID NO: 57         and CDR-L3 as depicted in SEQ ID NO: 58;     -   CDR-H1 as depicted in SEQ ID NO: 66, CDR-H2 as depicted in SEQ         ID NO: 67, CDR-H3 as depicted in SEQ ID NO: 68, CDR-L1 as         depicted in SEQ ID NO: 69, CDR-L2 as depicted in SEQ ID NO: 70         and CDR-L3 as depicted in SEQ ID NO: 71;     -   CDR-H1 as depicted in SEQ ID NO: 79, CDR-H2 as depicted in SEQ         ID NO: 80, CDR-H3 as depicted in SEQ ID NO: 81, CDR-L1 as         depicted in SEQ ID NO: 82, CDR-L2 as depicted in SEQ ID NO: 83         and CDR-L3 as depicted in SEQ ID NO: 84;     -   CDR-H1 as depicted in SEQ ID NO: 92, CDR-H2 as depicted in SEQ         ID NO: 93, CDR-H3 as depicted in SEQ ID NO: 94, CDR-L1 as         depicted in SEQ ID NO: 95, CDR-L2 as depicted in SEQ ID NO: 96         and CDR-L3 as depicted in SEQ ID NO: 97;     -   CDR-H1 as depicted in SEQ ID NO: 105, CDR-H2 as depicted in SEQ         ID NO: 106, CDR-H3 as depicted in SEQ ID NO: 107, CDR-L1 as         depicted in SEQ ID NO: 108, CDR-L2 as depicted in SEQ ID NO: 109         and CDR-L3 as depicted in SEQ ID NO: 110;     -   CDR-H1 as depicted in SEQ ID NO: 118, CDR-H2 as depicted in SEQ         ID NO: 119, CDR-H3 as depicted in SEQ ID NO: 120, CDR-L1 as         depicted in SEQ ID NO: 121, CDR-L2 as depicted in SEQ ID NO: 122         and CDR-L3 as depicted in SEQ ID NO: 123;     -   CDR-H1 as depicted in SEQ ID NO: 131, CDR-H2 as depicted in SEQ         ID NO: 132, CDR-H3 as depicted in SEQ ID NO: 133, CDR-L1 as         depicted in SEQ ID NO: 134, CDR-L2 as depicted in SEQ ID NO: 135         and CDR-L3 as depicted in SEQ ID NO: 136;     -   CDR-H1 as depicted in SEQ ID NO: 144, CDR-H2 as depicted in SEQ         ID NO: 145, CDR-H3 as depicted in SEQ ID NO: 146, CDR-L1 as         depicted in SEQ ID NO: 147, CDR-L2 as depicted in SEQ ID NO: 148         and CDR-L3 as depicted in SEQ ID NO: 149;     -   CDR-H1 as depicted in SEQ ID NO: 157, CDR-H2 as depicted in SEQ         ID NO: 158, CDR-H3 as depicted in SEQ ID NO: 159, CDR-L1 as         depicted in SEQ ID NO: 160, CDR-L2 as depicted in SEQ ID NO: 161         and CDR-L3 as depicted in SEQ ID NO: 162,     -   CDR-H1 as depicted in SEQ ID NO: 170, CDR-H2 as depicted in SEQ         ID NO: 171, CDR-H3 as depicted in SEQ ID NO: 172, CDR-L1 as         depicted in SEQ ID NO: 173, CDR-L2 as depicted in SEQ ID NO: 174         and CDR-L3 as depicted in SEQ ID NO: 175;     -   CDR-H1 as depicted in SEQ ID NO: 183, CDR-H2 as depicted in SEQ         ID NO: 184, CDR-H3 as depicted in SEQ ID NO: 185, CDR-L1 as         depicted in SEQ ID NO: 186, CDR-L2 as depicted in SEQ ID NO: 187         and CDR-L3 as depicted in SEQ ID NO: 188;     -   CDR-H1 as depicted in SEQ ID NO: 196, CDR-H2 as depicted in SEQ         ID NO: 197, CDR-H3 as depicted in SEQ ID NO: 198, CDR-L1 as         depicted in SEQ ID NO: 199, CDR-L2 as depicted in SEQ ID NO: 200         and CDR-L3 as depicted in SEQ ID NO: 201;     -   CDR-H1 as depicted in SEQ ID NO: 209, CDR-H2 as depicted in SEQ         ID NO: 210, CDR-H3 as depicted in SEQ ID NO: 211, CDR-L1 as         depicted in SEQ ID NO: 212, CDR-L2 as depicted in SEQ ID NO: 213         and CDR-L3 as depicted in SEQ ID NO: 214;     -   CDR-H1 as depicted in SEQ ID NO: 222, CDR-H2 as depicted in SEQ         ID NO: 223, CDR-H3 as depicted in SEQ ID NO: 224, CDR-L1 as         depicted in SEQ ID NO: 225, CDR-L2 as depicted in SEQ ID NO: 226         and CDR-L3 as depicted in SEQ ID NO: 227;     -   CDR-H1 as depicted in SEQ ID NO: 235, CDR-H2 as depicted in SEQ         ID NO: 236, CDR-H3 as depicted in SEQ ID NO: 237, CDR-L1 as         depicted in SEQ ID NO: 238, CDR-L2 as depicted in SEQ ID NO: 239         and CDR-L3 as depicted in SEQ ID NO: 240;     -   CDR-H1 as depicted in SEQ ID NO: 248, CDR-H2 as depicted in SEQ         ID NO: 249, CDR-H3 as depicted in SEQ ID NO: 250, CDR-L1 as         depicted in SEQ ID NO: 251, CDR-L2 as depicted in SEQ ID NO: 252         and CDR-L3 as depicted in SEQ ID NO: 253;     -   CDR-H1 as depicted in SEQ ID NO: 261, CDR-H2 as depicted in SEQ         ID NO: 262, CDR-H3 as depicted in SEQ ID NO: 263, CDR-L1 as         depicted in SEQ ID NO: 264, CDR-L2 as depicted in SEQ ID NO: 265         and CDR-L3 as depicted in SEQ ID NO: 266;     -   CDR-H1 as depicted in SEQ ID NO: 274, CDR-H2 as depicted in SEQ         ID NO: 275, CDR-H3 as depicted in SEQ ID NO: 276, CDR-L1 as         depicted in SEQ ID NO: 277, CDR-L2 as depicted in SEQ ID NO: 278         and CDR-L3 as depicted in SEQ ID NO: 279;     -   CDR-H1 as depicted in SEQ ID NO: 287, CDR-H2 as depicted in SEQ         ID NO: 288, CDR-H3 as depicted in SEQ ID NO: 289, CDR-L1 as         depicted in SEQ ID NO: 290, CDR-L2 as depicted in SEQ ID NO: 291         and CDR-L3 as depicted in SEQ ID NO: 292;     -   CDR-H1 as depicted in SEQ ID NO: 300, CDR-H2 as depicted in SEQ         ID NO: 301, CDR-H3 as depicted in SEQ ID NO: 302, CDR-L1 as         depicted in SEQ ID NO: 303, CDR-L2 as depicted in SEQ ID NO: 304         and CDR-L3 as depicted in SEQ ID NO: 305;     -   CDR-H1 as depicted in SEQ ID NO: 313, CDR-H2 as depicted in SEQ         ID NO: 314, CDR-H3 as depicted in SEQ ID NO: 315, CDR-L1 as         depicted in SEQ ID NO: 316, CDR-L2 as depicted in SEQ ID NO: 317         and CDR-L3 as depicted in SEQ ID NO: 318;     -   CDR-H1 as depicted in SEQ ID NO: 508, CDR-H2 as depicted in SEQ         ID NO: 509, CDR-H3 as depicted in SEQ ID NO: 510, CDR-L1 as         depicted in SEQ ID NO: 511, CDR-L2 as depicted in SEQ ID NO: 512         and CDR-L3 as depicted in SEQ ID NO: 513;     -   CDR-H1 as depicted in SEQ ID NO: 521, CDR-H2 as depicted in SEQ         ID NO: 522, CDR-H3 as depicted in SEQ ID NO: 523, CDR-L1 as         depicted in SEQ ID NO: 524, CDR-L2 as depicted in SEQ ID NO: 525         and CDR-L3 as depicted in SEQ ID NO: 526;     -   CDR-H1 as depicted in SEQ ID NO: 534, CDR-H2 as depicted in SEQ         ID NO: 535, CDR-H3 as depicted in SEQ ID NO: 536, CDR-L1 as         depicted in SEQ ID NO: 537, CDR-L2 as depicted in SEQ ID NO: 538         and CDR-L3 as depicted in SEQ ID NO: 539;     -   CDR-H1 as depicted in SEQ ID NO: 547, CDR-H2 as depicted in SEQ         ID NO: 548, CDR-H3 as depicted in SEQ ID NO: 549, CDR-L1 as         depicted in SEQ ID NO: 550, CDR-L2 as depicted in SEQ ID NO: 551         and CDR-L3 as depicted in SEQ ID NO: 552;     -   CDR-H1 as depicted in SEQ ID NO: 560, CDR-H2 as depicted in SEQ         ID NO: 561, CDR-H3 as depicted in SEQ ID NO: 562, CDR-L1 as         depicted in SEQ ID NO: 563, CDR-L2 as depicted in SEQ ID NO: 564         and CDR-L3 as depicted in SEQ ID NO: 565;     -   CDR-H1 as depicted in SEQ ID NO: 573, CDR-H2 as depicted in SEQ         ID NO: 574, CDR-H3 as depicted in SEQ ID NO: 575, CDR-L1 as         depicted in SEQ ID NO: 576, CDR-L2 as depicted in SEQ ID NO: 577         and CDR-L3 as depicted in SEQ ID NO: 578; and     -   CDR-H1 as depicted in SEQ ID NO: 586 CDR-H2 as depicted in SEQ         ID NO: 587, CDR-H3 as depicted in SEQ ID NO: 588, CDR-L1 as         depicted in SEQ ID NO: 589, CDR-L2 as depicted in SEQ ID NO: 590         and CDR-L3 as depicted in SEQ ID NO: 591; and -   (b) CDR-H1 as depicted in SEQ ID NO: 1, CDR-H2 as depicted in SEQ ID     NO: 2, CDR-H3 as depicted in SEQ ID NO: 3, CDR-L1 as depicted in SEQ     ID NO: 4, CDR-L2 as depicted in SEQ ID NO: 5 and CDR-L3 as depicted     in SEQ ID NO: 6;     -   CDR-H1 as depicted in SEQ ID NO: 326, CDR-H2 as depicted in SEQ         ID NO: 327, CDR-H3 as depicted in SEQ ID NO: 328, CDR-L1 as         depicted in SEQ ID NO: 329, CDR-L2 as depicted in SEQ ID NO: 330         and CDR-L3 as depicted in SEQ ID NO: 331;     -   CDR-H1 as depicted in SEQ ID NO: 339, CDR-H2 as depicted in SEQ         ID NO: 340, CDR-H3 as depicted in SEQ ID NO: 341, CDR-L1 as         depicted in SEQ ID NO: 342, CDR-L2 as depicted in SEQ ID NO: 343         and CDR-L3 as depicted in SEQ ID NO: 344,     -   CDR-H1 as depicted in SEQ ID NO: 352, CDR-H2 as depicted in SEQ         ID NO: 353, CDR-H3 as depicted in SEQ ID NO: 354, CDR-L1 as         depicted in SEQ ID NO: 355, CDR-L2 as depicted in SEQ ID NO: 356         and CDR-L3 as depicted in SEQ ID NO: 357;     -   CDR-H1 as depicted in SEQ ID NO: 365, CDR-H2 as depicted in SEQ         ID NO: 366, CDR-H3 as depicted in SEQ ID NO: 367, CDR-L1 as         depicted in SEQ ID NO: 368, CDR-L2 as depicted in SEQ ID NO: 369         and CDR-L3 as depicted in SEQ ID NO: 370;     -   CDR-H1 as depicted in SEQ ID NO: 378, CDR-H2 as depicted in SEQ         ID NO: 379, CDR-H3 as depicted in SEQ ID NO: 380, CDR-L1 as         depicted in SEQ ID NO: 381, CDR-L2 as depicted in SEQ ID NO: 382         and CDR-L3 as depicted in SEQ ID NO: 383;     -   CDR-H1 as depicted in SEQ ID NO: 391, CDR-H2 as depicted in SEQ         ID NO: 392, CDR-H3 as depicted in SEQ ID NO: 393, CDR-L1 as         depicted in SEQ ID NO: 394, CDR-L2 as depicted in SEQ ID NO: 395         and CDR-L3 as depicted in SEQ ID NO: 396;     -   CDR-H1 as depicted in SEQ ID NO: 404, CDR-H2 as depicted in SEQ         ID NO: 405, CDR-H3 as depicted in SEQ ID NO: 406, CDR-L1 as         depicted in SEQ ID NO: 407, CDR-L2 as depicted in SEQ ID NO: 408         and CDR-L3 as depicted in SEQ ID NO: 409;     -   CDR-H1 as depicted in SEQ ID NO: 417, CDR-H2 as depicted in SEQ         ID NO: 418, CDR-H3 as depicted in SEQ ID NO: 419, CDR-L1 as         depicted in SEQ ID NO: 420, CDR-L2 as depicted in SEQ ID NO: 421         and CDR-L3 as depicted in SEQ ID NO: 422;     -   CDR-H1 as depicted in SEQ ID NO: 430, CDR-H2 as depicted in SEQ         ID NO: 431, CDR-H3 as depicted in SEQ ID NO: 432, CDR-L1 as         depicted in SEQ ID NO: 433, CDR-L2 as depicted in SEQ ID NO: 434         and CDR-L3 as depicted in SEQ ID NO: 435;     -   CDR-H1 as depicted in SEQ ID NO: 443, CDR-H2 as depicted in SEQ         ID NO: 444, CDR-H3 as depicted in SEQ ID NO: 445, CDR-L1 as         depicted in SEQ ID NO: 446, CDR-L2 as depicted in SEQ ID NO: 447         and CDR-L3 as depicted in SEQ ID NO: 448;     -   CDR-H1 as depicted in SEQ ID NO: 456, CDR-H2 as depicted in SEQ         ID NO: 457, CDR-H3 as depicted in SEQ ID NO: 458, CDR-L1 as         depicted in SEQ ID NO: 459, CDR-L2 as depicted in SEQ ID NO: 460         and CDR-L3 as depicted in SEQ ID NO: 461,     -   CDR-H1 as depicted in SEQ ID NO: 482, CDR-H2 as depicted in SEQ         ID NO: 483, CDR-H3 as depicted in SEQ ID NO: 484, CDR-L1 as         depicted in SEQ ID NO: 485, CDR-L2 as depicted in SEQ ID NO: 486         and CDR-L3 as depicted in SEQ ID NO: 487;     -   CDR-H1 as depicted in SEQ ID NO: 495, CDR-H2 as depicted in SEQ         ID NO: 496, CDR-H3 as depicted in SEQ ID NO: 497, CDR-L1 as         depicted in SEQ ID NO: 498, CDR-L2 as depicted in SEQ ID NO: 499         and CDR-L3 as depicted in SEQ ID NO: 500; and     -   CDR-H1 as depicted in SEQ ID NO: 599, CDR-H2 as depicted in SEQ         ID NO: 600, CDR-H3 as depicted in SEQ ID NO: 601, CDR-L1 as         depicted in SEQ ID NO: 602, CDR-L2 as depicted in SEQ ID NO: 603         and CDR-L3 as depicted in SEQ ID NO: 604.

As described in appended example 3, a broad number of CDH19 specific binding domains has been characterized with respect to their binding specificities, and those binding domains were classified into two different groups, each group specifically recognizing one CDH19 epitope cluster. The epitope clusters that were defined—in the context of the present invention—in the extracellular domain of human CDH19 are depicted in FIG. 5. The first group of binding domains was identified to bind to human CDH19 epitope cluster 1 and encompasses the binding domains comprising the CDR sequences depicted under item (a) above. This first group of binding domains preferably does not bind to any additional epitope or epitope cluster (except for epitope cluster 1) within the CDH19 amino acid sequence. The second group of binding domains was identified to bind to human CDH19 epitope cluster 3 and encompasses the binding domains comprising the CDR sequences depicted under item (b) above. This second group of binding domains preferably does not bind to any additional epitope or epitope cluster (except for epitope cluster 3) within the CDH19 amino acid sequence. Epitope clusters 1 and 3 of human CDH19 correspond to amino acid residues as 44-141 in SEQ ID NO: 1836 (epitope cluster 1) and 250-364SEQ ID NO: 1836 (epitope cluster 3).

It must be noted that as used herein, the singular forms “a”, “an”, and “the” include plural references unless the context clearly indicates otherwise. Thus, for example, reference to “a reagent” includes one or more of such different reagents and reference to “the method” includes reference to equivalent steps and methods known to those of ordinary skill in the art that could be modified or substituted for the methods described herein.

Unless otherwise indicated, the term “at least” preceding a series of elements is to be understood to refer to every element in the series. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Such equivalents are intended to be encompassed by the present invention.

The term “and/or” wherever used herein includes the meaning of “and”, “or” and “all or any other combination of the elements connected by said term”.

The term “about” or “approximately” as used herein means within ±20%, preferably within ±15%, more preferably within ±10%, and most preferably within ±5% of a given value or range.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word “comprise”, and variations such as “comprises” and “comprising”, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integer or step. When used herein the term “comprising” can be substituted with the term “containing” or “including” or sometimes when used herein with the term “having”.

When used herein “consisting of” excludes any element, step, or ingredient not specified in the claim element. When used herein, “consisting essentially of” does not exclude materials or steps that do not materially affect the basic and novel characteristics of the claim.

In each instance herein any of the terms “comprising”, “consisting essentially of” and “consisting of” may be replaced with either of the other two terms.

The term “antibody construct” refers to a molecule in which the structure and/or function is/are based on the structure and/or function of an antibody, e.g. of a full-length or whole immunoglobulin molecule. An antibody construct is hence capable of binding to its specific target or antigen. Furthermore, an antibody construct according to the invention comprises the minimum structural requirements of an antibody which allow for the target binding. This minimum requirement may e.g. be defined by the presence of at least the three light chain CDRs (i.e. CDR1, CDR2 and CDR3 of the VL region) and/or the three heavy chain CDRs (i.e. CDR1, CDR2 and CDR3 of the VH region). The antibodies on which the constructs according to the invention are based include for example monoclonal, recombinant, chimeric, deimmunized, humanized and human antibodies.

Within the definition of “antibody constructs” according to the invention are full-length or whole antibodies including camelid antibodies and other immunoglobulin antibodies generated by biotechnological or protein engineering methods or processes. These full-length antibodies may be for example monoclonal, recombinant, chimeric, deimmunized, humanized and human antibodies. Also within the definition of “antibody constructs” are fragments of full-length antibodies, such as VH, VHH, VL, (s)dAb, Fv, Fd, Fab, Fab′, F(ab′)2 or “r IgG” (“half antibody”). Antibody constructs according to the invention may also be modified fragments of antibodies, also called antibody variants, such as scFv, di-scFv or bi(s)-scFv, scFv-Fc, scFv-zipper, scFab, Fab2, Fab3, diabodies, single chain diabodies, tandem diabodies (Tandab's), tandem di-scFv, tandem tri-scFv, “minibodies” exemplified by a structure which is as follows: (VH-VL-CH3)2, (scFv-CH3)2 or (scFv-CH3-scFv)2, multibodies such as triabodies or tetrabodies, and single domain antibodies such as nanobodies or single variable domain antibodies comprising merely one variable domain, which might be VHH, VH or VL, that specifically bind an antigen or epitope independently of other V regions or domains.

Furthermore, the definition of the term “antibody constructs” includes monovalent, bivalent and polyvalent/multivalent constructs and, thus, monospecific constructs, specifically binding to only one antigenic structure, as well as bispecific and polyspecific/multispecific constructs, which specifically bind more than one antigenic structure, e.g. two, three or more, through distinct binding domains. Moreover, the definition of the term “antibody constructs” includes molecules consisting of only one polypeptide chain as well as molecules consisting of more than one polypeptide chain, which chains can be either identical (homodimers, homotrimers or homo oligomers) or different (heterodimer, heterotrimer or heterooligomer). Examples for the above identified antibodies and variants or derivatives thereof are described inter alia in Harlow and Lane, Antibodies a laboratory manual, CSHL Press (1988) and Using Antibodies: a laboratory manual, CSHL Press (1999), Kontermann and Diibel, Antibody Engineering, Springer, 2nd ed. 2010 and Little, Recombinant Antibodies for Immunotherapy, Cambridge University Press 2009.

The antibody constructs of the present invention are preferably “in vitro generated antibody constructs”. This term refers to an antibody construct according to the above definition where all or part of the variable region (e.g., at least one CDR) is generated in a non-immune cell selection, e.g., an in vitro phage display, protein chip or any other method in which candidate sequences can be tested for their ability to bind to an antigen. This term thus preferably excludes sequences generated solely by genomic rearrangement in an immune cell in an animal. A “recombinant antibody” is an antibody made through the use of recombinant DNA technology or genetic engineering.

The term “monoclonal antibody” (mAb) or monoclonal antibody construct as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical except for possible naturally occurring mutations and/or post-translation modifications (e.g., isomerizations, amidations) that may be present in minor amounts. Monoclonal antibodies are highly specific, being directed against a single antigenic site or determinant on the antigen, in contrast to conventional (polyclonal) antibody preparations which typically include different antibodies directed against different determinants (or epitopes). In addition to their specificity, the monoclonal antibodies are advantageous in that they are synthesized by the hybridoma culture, hence uncontaminated by other immunoglobulins. The modifier “monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.

For the preparation of monoclonal antibodies, any technique providing antibodies produced by continuous cell line cultures can be used. For example, monoclonal antibodies to be used may be made by the hybridoma method first described by Koehler et al., Nature, 256: 495 (1975), or may be made by recombinant DNA methods (see, e.g., U.S. Pat. No. 4,816,567). Examples for further techniques to produce human monoclonal antibodies include the trioma technique, the human B-cell hybridoma technique (Kozbor, Immunology Today 4 (1983), 72) and the EBV-hybridoma technique (Cole et al., Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, Inc. (1985), 77-96).

Hybridomas can then be screened using standard methods, such as enzyme-linked immunosorbent assay (ELISA) and surface plasmon resonance (BIACORE™) analysis, to identify one or more hybridomas that produce an antibody that specifically binds with a specified antigen. Any form of the relevant antigen may be used as the immunogen, e.g., recombinant antigen, naturally occurring forms, any variants or fragments thereof, as well as an antigenic peptide thereof. Surface plasmon resonance as employed in the BIAcore system can be used to increase the efficiency of phage antibodies which bind to an epitope of a target antigen, such as CDH19 or CD3 epsilon (Schier, Human Antibodies Hybridomas 7 (1996), 97-105; Malmborg, J. Immunol. Methods 183 (1995), 7-13).

Another exemplary method of making monoclonal antibodies includes screening protein expression libraries, e.g., phage display or ribosome display libraries. Phage display is described, for example, in Ladner et al., U.S. Pat. No. 5,223,409; Smith (1985) Science 228:1315-1317, Clackson et al., Nature, 352: 624-628 (1991) and Marks et al., J. Mol. Biol., 222: 581-597 (1991).

In addition to the use of display libraries, the relevant antigen can be used to immunize a non-human animal, e.g., a rodent (such as a mouse, hamster, rabbit or rat). In one embodiment, the non-human animal includes at least a part of a human immunoglobulin gene. For example, it is possible to engineer mouse strains deficient in mouse antibody production with large fragments of the human Ig (immunoglobulin) loci. Using the hybridoma technology, antigen-specific monoclonal antibodies derived from the genes with the desired specificity may be produced and selected. See, e.g., XENOMOUSE™, Green et al. (1994) Nature Genetics 7:13-21, US 2003-0070185, WO 96/34096, and WO96/33735.

A monoclonal antibody can also be obtained from a non-human animal, and then modified, e.g., humanized, deimmunized, rendered chimeric etc., using recombinant DNA techniques known in the art. Examples of modified antibody constructs include humanized variants of non-human antibodies, “affinity matured” antibodies (see, e.g. Hawkins et al. J. Mol. Biol. 254, 889-896 (1992) and Lowman et al., Biochemistry 30, 10832-10837 (1991)) and antibody mutants with altered effector function(s) (see, e.g., U.S. Pat. No. 5,648,260, Kontermann and Diibel (2010), loc. cit. and Little (2009), loc. cit.).

In immunology, affinity maturation is the process by which B cells produce antibodies with increased affinity for antigen during the course of an immune response. With repeated exposures to the same antigen, a host will produce antibodies of successively greater affinities Like the natural prototype, the in vitro affinity maturation is based on the principles of mutation and selection. The in vitro affinity maturation has successfully been used to optimize antibodies, antibody constructs, and antibody fragments. Random mutations inside the CDRs are introduced using radiation, chemical mutagens or error-prone PCR. In addition, the genetical diversity can be increased by chain shuffling. Two or three rounds of mutation and selection using display methods like phage display usually results in antibody fragments with affinities in the low nanomolar range.

A preferred type of an amino acid substitutional varianation of the antibody constructs involves substituting one or more hypervariable region residues of a parent antibody (e. g. a humanized or human antibody). Generally, the resulting variant(s) selected for further development will have improved biological properties relative to the parent antibody from which they are generated. A convenient way for generating such substitutional variants involves affinity maturation using phage display. Briefly, several hypervariable region sites (e. g. 6-7 sites) are mutated to generate all possible amino acid substitutions at each site. The antibody variants thus generated are displayed in a monovalent fashion from filamentous phage particles as fusions to the gene III product of M13 packaged within each particle. The phage-displayed variants are then screened for their biological activity (e. g. binding affinity) as herein disclosed. In order to identify candidate hypervariable region sites for modification, alanine scanning mutagenesis can be performed to identify hypervariable region residues contributing significantly to antigen binding. Alternatively, or additionally, it may be beneficial to analyze a crystal structure of the antigen-antibody complex to identify contact points between the binding domain and, e.g., human CDH19. Such contact residues and neighbouring residues are candidates for substitution according to the techniques elaborated herein. Once such variants are generated, the panel of variants is subjected to screening as described herein and antibodies with superior properties in one or more relevant assays may be selected for further development.

The monoclonal antibodies and antibody constructs of the present invention specifically include “chimeric” antibodies (immunoglobulins) in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is/are identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U.S. Pat. No. 4,816,567; Morrison et al., Proc. Natl. Acad. Sci. USA, 81: 6851-6855 (1984)). Chimeric antibodies of interest herein include “primitized” antibodies comprising variable domain antigen-binding sequences derived from a non-human primate (e.g., Old World Monkey, Ape etc.) and human constant region sequences. A variety of approaches for making chimeric antibodies have been described. See e.g., Morrison et al., Proc. Natl. Acad. ScL U.S.A. 81:6851, 1985; Takeda et al., Nature 314:452, 1985, Cabilly et al., U.S. Pat. No. 4,816,567; Boss et al., U.S. Pat. No. 4,816,397; Tanaguchi et al., EP 0171496; EP 0173494; and GB 2177096.

An antibody, antibody construct or antibody fragment may also be modified by specific deletion of human T cell epitopes (a method called “deimmunization”) by the methods disclosed in WO 98/52976 and WO 00/34317. Briefly, the heavy and light chain variable domains of an antibody can be analyzed for peptides that bind to MHC class II; these peptides represent potential T cell epitopes (as defined in WO 98/52976 and WO 00/34317). For detection of potential T cell epitopes, a computer modeling approach termed “peptide threading” can be applied, and in addition a database of human MHC class II binding peptides can be searched for motifs present in the VH and VL sequences, as described in WO 98/52976 and WO 00/34317. These motifs bind to any of the 18 major MHC class II DR allotypes, and thus constitute potential T cell epitopes. Potential T cell epitopes detected can be eliminated by substituting small numbers of amino acid residues in the variable domains, or preferably, by single amino acid substitutions. Typically, conservative substitutions are made. Often, but not exclusively, an amino acid common to a position in human germline antibody sequences may be used. Human germline sequences are disclosed e.g. in Tomlinson, et al. (1992) J. MoI. Biol. 227:776-798; Cook, G. P. et al. (1995) Immunol. Today Vol. 16 (5): 237-242; and Tomlinson et al. (1995) EMBO J. 14: 14:4628-4638. The V BASE directory provides a comprehensive directory of human immunoglobulin variable region sequences (compiled by Tomlinson, L A. et al. MRC Centre for Protein Engineering, Cambridge, UK). These sequences can be used as a source of human sequence, e.g., for framework regions and CDRs. Consensus human framework regions can also be used, for example as described in U.S. Pat. No. 6,300,064.

“Humanized” antibodies, antibody constructs or fragments thereof (such as Fv, Fab, Fab′, F(ab′)2 or other antigen-binding subsequences of antibodies) are antibodies or immunoglobulins of mostly human sequences, which contain (a) minimal sequence(s) derived from non-human immunoglobulin. For the most part, humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a hypervariable region (also CDR) of the recipient are replaced by residues from a hypervariable region of a non-human (e.g., rodent) species (donor antibody) such as mouse, rat, hamster or rabbit having the desired specificity, affinity, and capacity. In some instances, Fv framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues. Furthermore, “humanized antibodies” as used herein may also comprise residues which are found neither in the recipient antibody nor the donor antibody. These modifications are made to further refine and optimize antibody performance. The humanized antibody may also comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin. For further details, see Jones et al., Nature, 321: 522-525 (1986); Reichmann et al., Nature, 332: 323-329 (1988); and Presta, Curr. Op. Struct. Biol., 2: 593-596 (1992).

Humanized antibodies or fragments thereof can be generated by replacing sequences of the Fv variable domain that are not directly involved in antigen binding with equivalent sequences from human Fv variable domains. Exemplary methods for generating humanized antibodies or fragments thereof are provided by Morrison (1985) Science 229:1202-1207; by Oi et al. (1986) BioTechniques 4:214; and by U.S. Pat. No. 5,585,089; U.S. Pat. No. 5,693,761; U.S. Pat. No. 5,693,762; U.S. Pat. No. 5,859,205; and U.S. Pat. No. 6,407,213. Those methods include isolating, manipulating, and expressing the nucleic acid sequences that encode all or part of immunoglobulin Fv variable domains from at least one of a heavy or light chain. Such nucleic acids may be obtained from a hybridoma producing an antibody against a predetermined target, as described above, as well as from other sources. The recombinant DNA encoding the humanized antibody molecule can then be cloned into an appropriate expression vector.

Humanized antibodies may also be produced using transgenic animals such as mice that express human heavy and light chain genes, but are incapable of expressing the endogenous mouse immunoglobulin heavy and light chain genes. Winter describes an exemplary CDR grafting method that may be used to prepare the humanized antibodies described herein (U.S. Pat. No. 5,225,539). All of the CDRs of a particular human antibody may be replaced with at least a portion of a non-human CDR, or only some of the CDRs may be replaced with non-human CDRs. It is only necessary to replace the number of CDRs required for binding of the humanized antibody to a predetermined antigen.

A humanized antibody can be optimized by the introduction of conservative substitutions, consensus sequence substitutions, germline substitutions and/or back mutations. Such altered immunoglobulin molecules can be made by any of several techniques known in the art, (e.g., Teng et al., Proc. Natl. Acad. Sci. U.S.A., 80: 7308-7312, 1983; Kozbor et al., Immunology Today, 4: 7279, 1983; Olsson et al., Meth. Enzymol., 92: 3-16, 1982, and EP 239 400.

The term “human antibody”, “human antibody construct” and “human binding domain” includes antibodies, antibody constructs and binding domains having antibody regions such as variable and constant regions or domains which correspond substantially to human germline immunoglobulin sequences known in the art, including, for example, those described by Kabat et al. (1991) (loc. cit.). The human antibodies, antibody constructs or binding domains of the invention may include amino acid residues not encoded by human germline immunoglobulin sequences (e.g., mutations introduced by random or site-specific mutagenesis in vitro or by somatic mutation in vivo), for example in the CDRs, and in particular, in CDR3. The human antibodies, antibody constructs or binding domains can have at least one, two, three, four, five, or more positions replaced with an amino acid residue that is not encoded by the human germline immunoglobulin sequence. The definition of human antibodies, antibody constructs and binding domains as used herein also contemplates fully human antibodies, which include only non-artificially and/or genetically altered human sequences of antibodies as those can be derived by using technologies or systems such as the Xenomouse.

In some embodiments, the antibody constructs of the invention are “isolated” or “substantially pure” antibody constructs. “Isolated” or “substantially pure” when used to describe the antibody construct disclosed herein means an antibody construct that has been identified, separated and/or recovered from a component of its production environment. Preferably, the antibody construct is free or substantially free of association with all other components from its production environment. Contaminant components of its production environment, such as that resulting from recombinant transfected cells, are materials that would typically interfere with diagnostic or therapeutic uses for the polypeptide, and may include enzymes, hormones, and other proteinaceous or non-proteinaceous solutes. The antibody constructs may e.g constitute at least about 5%, or at least about 50% by weight of the total protein in a given sample. It is understood that the isolated protein may constitute from 5% to 99.9% by weight of the total protein content, depending on the circumstances. The polypeptide may be made at a significantly higher concentration through the use of an inducible promoter or high expression promoter, such that it is made at increased concentration levels. The definition includes the production of an antibody construct in a wide variety of organisms and/or host cells that are known in the art. In preferred embodiments, the antibody construct will be purified (1) to a degree sufficient to obtain at least 15 residues of N-terminal or internal amino acid sequence by use of a spinning cup sequenator, or (2) to homogeneity by SDS-PAGE under non-reducing or reducing conditions using Coomassie blue or, preferably, silver stain. Ordinarily, however, an isolated antibody construct will be prepared by at least one purification step.

The term “binding domain” characterizes in connection with the present invention a domain which (specifically) binds to/interacts with/recognizes a given target epitope or a given target site on the target molecules (antigens) CDH19 and CD3, respectively. The structure and function of the first binding domain (recognizing CDH19), and preferably also the structure and/or function of the second binding domain (CD3), is/are based on the structure and/or function of an antibody, e.g. of a full-length or whole immunoglobulin molecule. According to the invention, the first binding domain is characterized by the presence of three light chain CDRs (i.e. CDR1, CDR2 and CDR3 of the VL region) and three heavy chain CDRs (i.e. CDR1, CDR2 and CDR3 of the VH region). The second binding domain preferably also comprises the minimum structural requirements of an antibody which allow for the target binding. More preferably, the second binding domain comprises at least three light chain CDRs (i.e. CDR1, CDR2 and CDR3 of the VL region) and/or three heavy chain CDRs (i.e. CDR1, CDR2 and CDR3 of the VH region). It is envisaged that the first and/or second binding domain is produced by or obtainable by phage-display or library screening methods rather than by grafting CDR sequences from a pre-existing (monoclonal) antibody into a scaffold.

According to the present invention, binding domains are preferably in the form of polypeptides. Such polypeptides may include proteinaceous parts and non-proteinaceous parts (e.g. chemical linkers or chemical cross-linking agents such as glutaraldehyde). Proteins (including fragments thereof, preferably biologically active fragments, and peptides, usually having less than 30 amino acids) comprise two or more amino acids coupled to each other via a covalent peptide bond (resulting in a chain of amino acids). The term “polypeptide” as used herein describes a group of molecules, which usually consist of more than 30 amino acids. Polypeptides may further form multimers such as dimers, trimers and higher oligomers, i.e. consisting of more than one polypeptide molecule. Polypeptide molecules forming such dimers, trimers etc. may be identical or non-identical. The corresponding higher order structures of such multimers are, consequently, termed homo- or heterodimers, homo- or heterotrimers etc. An example for a hereteromultimer is an antibody molecule, which, in its naturally occurring form, consists of two identical light polypeptide chains and two identical heavy polypeptide chains. The terms “peptide”, “polypeptide” and “protein” also refer to naturally modified peptides/polypeptides/proteins wherein the modification is effected e.g. by post-translational modifications like glycosylation, acetylation, phosphorylation and the like. A “peptide”, “polypeptide” or “protein” when referred to herein may also be chemically modified such as pegylated. Such modifications are well known in the art and described herein below.

As mentioned above, a binding domain may typically comprise an antibody light chain variable region (VL) and an antibody heavy chain variable region (VH); however, it does not have to comprise both. Fd fragments, for example, have two VH regions and often retain some antigen-binding function of the intact antigen-binding domain. Examples of (modified) antigen-binding antibody fragments include (1) a Fab fragment, a monovalent fragment having the VL, VH, CL and CH1 domains; (2) a F(ab′)2 fragment, a bivalent fragment having two Fab fragments linked by a disulfide bridge at the hinge region; (3) an Fd fragment having the two VH and CH1 domains; (4) an Fv fragment having the VL and VH domains of a single arm of an antibody, (5) a dAb fragment (Ward et al., (1989) Nature 341:544-546), which has a VH domain; (6) an isolated complementarity determining region (CDR), and (7) a single chain Fv (scFv), the latter being preferred (for example, derived from an scFV-library).

Antibodies and antibody constructs comprising at least one human binding domain avoid some of the problems associated with antibodies or antibody constructs that possess non-human such as rodent (e.g. murine, rat, hamster or rabbit) variable and/or constant regions. The presence of such rodent derived proteins can lead to the rapid clearance of the antibodies or antibody constructs or can lead to the generation of an immune response against the antibody or antibody construct by a patient. In order to avoid the use of rodent derived antibodies or antibody constructs, human or fully human antibodies/antibody constructs can be generated through the introduction of human antibody function into a rodent so that the rodent produces fully human antibodies.

The ability to clone and reconstruct megabase-sized human loci in YACs and to introduce them into the mouse germline provides a powerful approach to elucidating the functional components of very large or crudely mapped loci as well as generating useful models of human disease. Furthermore, the use of such technology for substitution of mouse loci with their human equivalents could provide unique insights into the expression and regulation of human gene products during development, their communication with other systems, and their involvement in disease induction and progression.

An important practical application of such a strategy is the “humanization” of the mouse humoral immune system. Introduction of human immunoglobulin (Ig) loci into mice in which the endogenous Ig genes have been inactivated offers the opportunity to study the mechanisms underlying programmed expression and assembly of antibodies as well as their role in B-cell development. Furthermore, such a strategy could provide an ideal source for production of fully human monoclonal antibodies (mAbs)—an important milestone towards fulfilling the promise of antibody therapy in human disease. Fully human antibodies or antibody constructs are expected to minimize the immunogenic and allergic responses intrinsic to mouse or mouse-derivatized mAbs and thus to increase the efficacy and safety of the administered antibodies/antibody constructs. The use of fully human antibodies or antibody constructs can be expected to provide a substantial advantage in the treatment of chronic and recurring human diseases, such as inflammation, autoimmunity, and cancer, which require repeated compound administrations.

One approach towards this goal was to engineer mouse strains deficient in mouse antibody production with large fragments of the human Ig loci in anticipation that such mice would produce a large repertoire of human antibodies in the absence of mouse antibodies. Large human Ig fragments would preserve the large variable gene diversity as well as the proper regulation of antibody production and expression. By exploiting the mouse machinery for antibody diversification and selection and the lack of immunological tolerance to human proteins, the reproduced human antibody repertoire in these mouse strains should yield high affinity antibodies against any antigen of interest, including human antigens. Using the hybridoma technology, antigen-specific human mAbs with the desired specificity could be readily produced and selected. This general strategy was demonstrated in connection with the generation of the first XenoMouse mouse strains (see Green et al. Nature Genetics 7:13-21 (1994)). The XenoMouse strains were engineered with yeast artificial chromosomes (YACs) containing 245 kb and 190 kb-sized germline configuration fragments of the human heavy chain locus and kappa light chain locus, respectively, which contained core variable and constant region sequences. The human Ig containing YACs proved to be compatible with the mouse system for both rearrangement and expression of antibodies and were capable of substituting for the inactivated mouse Ig genes. This was demonstrated by their ability to induce B cell development, to produce an adult-like human repertoire of fully human antibodies, and to generate antigen-specific human mAbs. These results also suggested that introduction of larger portions of the human Ig loci containing greater numbers of V genes, additional regulatory elements, and human Ig constant regions might recapitulate substantially the full repertoire that is characteristic of the human humoral response to infection and immunization. The work of Green et al. was recently extended to the introduction of greater than approximately 80% of the human antibody repertoire through introduction of megabase sized, germline configuration YAC fragments of the human heavy chain loci and kappa light chain loci, respectively. See Mendez et al. Nature Genetics 15:146-156 (1997) and U.S. patent application Ser. No. 08/759,620.

The production of the XenoMouse mice is further discussed and delineated in U.S. patent applications Ser. No. 07/466,008, Ser. No. 07/610,515, Ser. No. 07/919,297, Ser. No. 07/922,649, Ser. No. 08/031,801, Ser. No. 08/112,848, Ser. No. 08/234,145, Ser. No. 08/376,279, Ser. No. 08/430,938, Ser. No. 08/464,584, Ser. No. 08/464,582, Ser. No. 08/463,191, Ser. No. 08/462,837, Ser. No. 08/486,853, Ser. No. 08/486,857, Ser. No. 08/486,859, Ser. No. 08/462,513, Ser. No. 08/724,752, and Ser. No. 08/759,620; and U.S. Pat. Nos. 6,162,963, 6,150,584, 6,114,598, 6,075,181, and 5,939,598 and Japanese Patent Nos. 3 068 180 B2, 3 068 506 B2, and 3 068 507 B2. See also Mendez et al. Nature Genetics 15:146-156 (1997) and Green and Jakobovits J. Exp. Med. 188:483-495 (1998), EP 0 463 151 B1, WO 94/02602, WO 96/34096, WO 98/24893, WO 00/76310, and WO 03/47336.

In an alternative approach, others, including GenPharm International, Inc., have utilized a “minilocus” approach. In the minilocus approach, an exogenous Ig locus is mimicked through the inclusion of pieces (individual genes) from the Ig locus. Thus, one or more VH genes, one or more DH genes, one or more JH genes, a mu constant region, and a second constant region (preferably a gamma constant region) are formed into a construct for insertion into an animal. This approach is described in U.S. Pat. No. 5,545,807 to Surani et al. and U.S. Pat. Nos. 5,545,806, 5,625,825, 5,625,126, 5,633,425, 5,661,016, 5,770,429, 5,789,650, 5,814,318, 5,877,397, 5,874,299, and 6,255,458 each to Lonberg and Kay, U.S. Pat. Nos. 5,591,669 and 6,023.010 to Krimpenfort and Berns, U.S. Pat. Nos. 5,612,205, 5,721,367, and 5,789,215 to Berns et al., and U.S. Pat. No. 5,643,763 to Choi and Dunn, and GenPharm International U.S. patent application Ser. No. 07/574,748, Ser. No. 07/575,962, Ser. No. 07/810,279, Ser. No. 07/853,408, Ser. No. 07/904,068, Ser. No. 07/990,860, Ser. No. 08/053,131, Ser. No. 08/096,762, Ser. No. 08/155,301, Ser. No. 08/161,739, Ser. No. 08/165,699, Ser. No. 08/209,741. See also EP 0 546 073 B1, WO 92/03918, WO 92/22645, WO 92/22647, WO 92/22670, WO 93/12227, WO 94/00569, WO 94/25585, WO 96/14436, WO 97/13852, and WO 98/24884 and U.S. Pat. No. 5,981,175. See further Taylor et al. (1992), Chen et al. (1993), Tuaillon et al. (1993), Choi et al. (1993), Lonberg et al. (1994), Taylor et al. (1994), and Tuaillon et al. (1995), Fishwild et al. (1996).

Kirin has also demonstrated the generation of human antibodies from mice in which, through microcell fusion, large pieces of chromosomes, or entire chromosomes, have been introduced. See European Patent Application Nos. 773 288 and 843 961. Xenerex Biosciences is developing a technology for the potential generation of human antibodies. In this technology, SCID mice are reconstituted with human lymphatic cells, e.g., B and/or T cells. Mice are then immunized with an antigen and can generate an immune response against the antigen. See U.S. Pat. Nos. 5,476,996; 5,698,767; and 5,958,765.

Human anti-mouse antibody (HAMA) responses have led the industry to prepare chimeric or otherwise humanized antibodies. It is however expected that certain human anti-chimeric antibody (HACA) responses will be observed, particularly in chronic or multi-dose utilizations of the antibody. Thus, it would be desirable to provide antibody constructs comprising a fully human binding domain against CDH19 and a fully human binding domain against CD3 in order to vitiate concerns and/or effects of HAMA or HACA response.

The terms “(specifically) binds to”, (specifically) recognizes”, “is (specifically) directed to”, and “(specifically) reacts with” mean in accordance with this invention that a binding domain interacts or specifically interacts with one or more, preferably at least two, more preferably at least three and most preferably at least four amino acids of an epitope located on the target protein or antigen (CDH19/CD3).

The term “epitope” refers to a site on an antigen to which a binding domain, such as an antibody or immunoglobulin or derivative or fragment of an antibody or of an immunoglobulin, specifically binds. An “epitope” is antigenic and thus the term epitope is sometimes also referred to herein as “antigenic structure” or “antigenic determinant”. Thus, the binding domain is an “antigen interaction site”. Said binding/interaction is also understood to define a “specific recognition”.

“Epitopes” can be formed both by contiguous amino acids or non-contiguous amino acids juxtaposed by tertiary folding of a protein. A “linear epitope” is an epitope where an amino acid primary sequence comprises the recognized epitope. A linear epitope typically includes at least 3 or at least 4, and more usually, at least 5 or at least 6 or at least 7, for example, about 8 to about 10 amino acids in a unique sequence.

A “conformational epitope”, in contrast to a linear epitope, is an epitope wherein the primary sequence of the amino acids comprising the epitope is not the sole defining component of the epitope recognized (e.g., an epitope wherein the primary sequence of amino acids is not necessarily recognized by the binding domain). Typically a conformational epitope comprises an increased number of amino acids relative to a linear epitope. With regard to recognition of conformational epitopes, the binding domain recognizes a three-dimensional structure of the antigen, preferably a peptide or protein or fragment thereof (in the context of the present invention, the antigen for one of the binding domains is comprised within the CDH19 protein). For example, when a protein molecule folds to form a three-dimensional structure, certain amino acids and/or the polypeptide backbone forming the conformational epitope become juxtaposed enabling the antibody to recognize the epitope. Methods of determining the conformation of epitopes include, but are not limited to, x-ray crystallography, two-dimensional nuclear magnetic resonance (2D-NMR) spectroscopy and site-directed spin labelling and electron paramagnetic resonance (EPR) spectroscopy.

The provided examples describe a further method to characterize a given binding domain, which includes a test whether the given binding domain binds to one or more epitope cluster(s) of a given protein, in particular CDH19.

As used herein, the term “epitope cluster” denotes the entirety of epitopes lying in a defined contiguous stretch of an antigen. An epitope cluster can comprise one, two or more epitopes. The concept of “epitope clusters” is also used in the characterization of the features of the antibody constructs of the invention. The epitope clusters that were defined—in the context of the present invention—in the extracellular domain of CDH19 are described above and depicted in FIG. 5.

When an epitope cluster in the human CDH19 protein is exchanged with the respective epitope cluster of a chicken CDH19 antigen (resulting in a construct comprising human CDH19, wherein one human epitope cluster is replaced with its counterpart chicken epitope cluster), a decrease in the binding of the binding domain will occur. Said decrease is preferably at least 10%, 20%, 30%, 40%, 50%; more preferably at least 60%, 70%, 80%, 90%, 95% or even 100% in comparison to the respective epitope cluster in the human CDH19 protein, whereby binding to the respective epitope cluster in the human CDH19 protein is set to be 100%. It is envisaged that the aforementioned human CDH19/chicken CDH19 chimeras are expressed in CHO cells. It is also envisaged that the human CDH19/chicken CDH19 chimeras are fused with a transmembrane domain and/or cytoplasmic domain of a different membrane-bound protein such as EpCAM.

A method to test this loss of binding due to exchange with the respective epitope cluster of a non-human (e.g. chicken, but others like mouse, rat, hamster, rabbit etc. might also be conceivable) CDH19 antigen is described in Examples 3. A further method to determine the contribution of a specific residue of a target antigen to the recognition by a antibody construct or binding domain is alanine scanning (see e.g. Morrison K L & Weiss GA. Cur Opin Chem Biol. 2001 June; 5(3):302-7), where each residue to be analyzed is replaced by alanine, e.g. via site-directed mutagenesis. Alanine is used because of its non-bulky, chemically inert, methyl functional group that nevertheless mimics the secondary structure references that many of the other amino acids possess. Sometimes bulky amino acids such as valine or leucine can be used in cases where conservation of the size of mutated residues is desired. Alanine scanning is a mature technology which has been used for a long period of time.

The interaction between the binding domain and the epitope or epitope cluster implies that a binding domain exhibits appreciable affinity for the epitope or epitope cluster on a particular protein or antigen (here: CDH19 and CD3, respectively) and, generally, does not exhibit significant reactivity with proteins or antigens other than CDH19 or CD3. “Appreciable affinity” includes binding with an affinity of about 10-6 M (KD) or stronger. Preferably, binding is considered specific when the binding affinity is about 10-12 to 10-8 M, 10-12 to 10-9 M, 10-12 to 10-10 M, 10-11 to 10-8 M, preferably of about 10-11 to 10-9 M. Whether a binding domain specifically reacts with or binds to a target can be tested readily by, inter alia, comparing the reaction of said binding domain with a target protein or antigen with the reaction of said binding domain with proteins or antigens other than CDH19 or CD3. Preferably, a binding domain of the invention does not essentially or substantially bind to proteins or antigens other than CDH19 or CD3 (i.e., the first binding domain is not capable of binding to proteins other than CDH19 and the second binding domain is not capable of binding to proteins other than CD3).

The term “does not essentially/substantially bind” or “is not capable of binding” means that a binding domain of the present invention does not bind a protein or antigen other than CDH19 or CD3, i.e., does not show reactivity of more than 30%, preferably not more than 20%, more preferably not more than 10%, particularly preferably not more than 9%, 8%, 7%, 6% or 5% with proteins or antigens other than CDH19 or CD3, whereby binding to CDH19 or CD3, respectively, is set to be 100%.

Specific binding is believed to be effected by specific motifs in the amino acid sequence of the binding domain and the antigen. Thus, binding is achieved as a result of their primary, secondary and/or tertiary structure as well as the result of secondary modifications of said structures. The specific interaction of the antigen-interaction-site with its specific antigen may result in a simple binding of said site to the antigen. Moreover, the specific interaction of the antigen-interaction-site with its specific antigen may alternatively or additionally result in the initiation of a signal, e.g. due to the induction of a change of the conformation of the antigen, an oligomerization of the antigen, etc.

The term “variable” refers to the portions of the antibody or immunoglobulin domains that exhibit variability in their sequence and that are involved in determining the specificity and binding affinity of a particular antibody (i.e., the “variable domain(s)”). The pairing of a variable heavy chain (VH) and a variable light chain (VL) together forms a single antigen-binding site. The CH domain most proximal to VH is designated as CH1. Each light (L) chain is linked to a heavy (H) chain by one covalent disulfide bond, while the two H chains are linked to each other by one or more disulfide bonds depending on the H chain isotype.

Variability is not evenly distributed throughout the variable domains of antibodies; it is concentrated in sub-domains of each of the heavy and light chain variable regions. These sub-domains are called “hypervariable regions” or “complementarity determining regions” (CDRs). The more conserved (i.e., non-hypervariable) portions of the variable domains are called the “framework” regions (FRM) and provide a scaffold for the six CDRs in three dimensional space to form an antigen-binding surface. The variable domains of naturally occurring heavy and light chains each comprise four FRM regions (FR1, FR2, FR3, and FR4), largely adopting a β-sheet configuration, connected by three hypervariable regions, which form loops connecting, and in some cases forming part of, the β-sheet structure. The hypervariable regions in each chain are held together in close proximity by the FRM and, with the hypervariable regions from the other chain, contribute to the formation of the antigen-binding site (see Kabat et al., loc. cit.). The constant domains are not directly involved in antigen binding, but exhibit various effector functions, such as, for example, antibody-dependent, cell-mediated cytotoxicity and complement activation.

The terms “CDR”, and its plural “CDRs”, refer to the complementarity determining region of which three make up the binding character of a light chain variable region (CDR-L1, CDR-L2 and CDR-L3) and three make up the binding character of a heavy chain variable region (CDR-H1, CDR-H2 and CDR-H3). CDRs contain most of the residues responsible for specific interactions of the antibody with the antigen and hence contribute to the functional activity of an antibody molecule: they are the main determinants of antigen specificity.

The exact definitional CDR boundaries and lengths are subject to different classification and numbering systems. CDRs may therefore be referred to by Kabat, Chothia, contact or any other boundary definitions, including the numbering system described herein. Despite differing boundaries, each of these systems has some degree of overlap in what constitutes the so called “hypervariable regions” within the variable sequences. CDR definitions according to these systems may therefore differ in length and boundary areas with respect to the adjacent framework region. See for example Kabat (an approach based on cross-species sequence variability), Chothia (an approach based on crystallographic studies of antigen-antibody complexes), and/or MacCallum (Kabat et al., loc. cit.; Chothia et al., J. MoI. Biol, 1987, 196: 901-917; and MacCallum et al., J. MoI. Biol, 1996, 262: 732). Still another standard for characterizing the antigen binding site is the AbM definition used by Oxford Molecular's AbM antibody modeling software. See, e.g., Protein Sequence and Structure Analysis of Antibody Variable Domains. In: Antibody Engineering Lab Manual (Ed.: Duebel, S. and Kontermann, R., Springer-Verlag, Heidelberg). To the extent that two residue identification techniques define regions of overlapping, but not identical regions, they can be combined to define a hybrid CDR. However, the numbering in accordance with the so-called Kabat system is preferred.

Typically, CDRs form a loop structure that can be classified as a canonical structure. The term “canonical structure” refers to the main chain conformation that is adopted by the antigen binding (CDR) loops. From comparative structural studies, it has been found that five of the six antigen binding loops have only a limited repertoire of available conformations. Each canonical structure can be characterized by the torsion angles of the polypeptide backbone. Correspondent loops between antibodies may, therefore, have very similar three dimensional structures, despite high amino acid sequence variability in most parts of the loops (Chothia and Lesk, J. MoI. Biol., 1987, 196: 901; Chothia et al., Nature, 1989, 342: 877; Martin and Thornton, J. MoI. Biol, 1996, 263: 800). Furthermore, there is a relationship between the adopted loop structure and the amino acid sequences surrounding it. The conformation of a particular canonical class is determined by the length of the loop and the amino acid residues residing at key positions within the loop, as well as within the conserved framework (i.e., outside of the loop). Assignment to a particular canonical class can therefore be made based on the presence of these key amino acid residues.

The term “canonical structure” may also include considerations as to the linear sequence of the antibody, for example, as catalogued by Kabat (Kabat et al., loc. cit.). The Kabat numbering scheme (system) is a widely adopted standard for numbering the amino acid residues of an antibody variable domain in a consistent manner and is the preferred scheme applied in the present invention as also mentioned elsewhere herein. Additional structural considerations can also be used to determine the canonical structure of an antibody. For example, those differences not fully reflected by Kabat numbering can be described by the numbering system of Chothia et al and/or revealed by other techniques, for example, crystallography and two- or three-dimensional computational modeling. Accordingly, a given antibody sequence may be placed into a canonical class which allows for, among other things, identifying appropriate chassis sequences (e.g., based on a desire to include a variety of canonical structures in a library). Kabat numbering of antibody amino acid sequences and structural considerations as described by Chothia et al., loc. cit. and their implications for construing canonical aspects of antibody structure, are described in the literature. The subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known in the art. For a review of the antibody structure, see Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory, eds. Harlow et al., 1988.

The CDR3 of the light chain and, particularly, the CDR3 of the heavy chain may constitute the most important determinants in antigen binding within the light and heavy chain variable regions. In some antibody constructs, the heavy chain CDR3 appears to constitute the major area of contact between the antigen and the antibody. In vitro selection schemes in which CDR3 alone is varied can be used to vary the binding properties of an antibody or determine which residues contribute to the binding of an antigen. Hence, CDR3 is typically the greatest source of molecular diversity within the antibody-binding site. H3, for example, can be as short as two amino acid residues or greater than 26 amino acids.

The sequence of antibody genes after assembly and somatic mutation is highly varied, and these varied genes are estimated to encode 1010 different antibody molecules (Immunoglobulin Genes, 2nd ed., eds. Jonio et al., Academic Press, San Diego, Calif., 1995). Accordingly, the immune system provides a repertoire of immunoglobulins. The term “repertoire” refers to at least one nucleotide sequence derived wholly or partially from at least one sequence encoding at least one immunoglobulin. The sequence(s) may be generated by rearrangement in vivo of the V, D, and J segments of heavy chains, and the V and J segments of light chains. Alternatively, the sequence(s) can be generated from a cell in response to which rearrangement occurs, e.g., in vitro stimulation. Alternatively, part or all of the sequence(s) may be obtained by DNA splicing, nucleotide synthesis, mutagenesis, and other methods, see, e.g., U.S. Pat. No. 5,565,332. A repertoire may include only one sequence or may include a plurality of sequences, including ones in a genetically diverse collection.

In one embodiment, the first binding domain of the antibody construct of the invention comprises a VH region selected from the group consisting of VH regions

-   (a) as depicted in SEQ ID NO: 21, SEQ ID NO: 34, SEQ ID NO: 47, SEQ     ID NO: 60, SEQ ID NO: 73, SEQ ID NO: 86, SEQ ID NO: 99, SEQ ID NO:     112, SEQ ID NO: 125, SEQ ID NO: 138, SEQ ID NO: 151, SEQ ID NO: 164,     SEQ ID NO: 177, SEQ ID NO: 190, SEQ ID NO: 203, SEQ ID NO: 216, SEQ     ID NO: 229, SEQ ID NO: 242, SEQ ID NO: 255, SEQ ID NO: 268, SEQ ID     NO: 281, SEQ ID NO: 294, SEQ ID NO: 307, SEQ ID NO: 320, SEQ ID NO:     515, SEQ ID NO: 528, SEQ ID NO: 541, SEQ ID NO: 554, SEQ ID NO: 567,     SEQ ID NO: 580 and SEQ ID NO: 593; and -   (b) as depicted in SEQ ID NO: 8, SEQ ID NO: 333, SEQ ID NO: 346, SEQ     ID NO: 359, SEQ ID NO: 372, SEQ ID NO: 385, SEQ ID NO: 398, SEQ ID     NO: 411, SEQ ID NO: 424, SEQ ID NO: 437, SEQ ID NO: 450, SEQ ID NO:     463, SEQ ID NO: 476, SEQ ID NO: 489, SEQ ID NO: 502 and SEQ ID NO:     606.

In a further embodiment of the antibody construct of the invention, the first binding domain comprises a VL region selected from the group consisting of VL regions

-   (a) as depicted in SEQ ID NO: 23, SEQ ID NO: 36, SEQ ID NO: 49, SEQ     ID NO: 62, SEQ ID NO: 75, SEQ ID NO: 88, SEQ ID NO: 101, SEQ ID NO:     114, SEQ ID NO: 127, SEQ ID NO: 140, SEQ ID NO: 153, SEQ ID NO: 166,     SEQ ID NO: 179, SEQ ID NO: 192, SEQ ID NO: 205, SEQ ID NO: 218, SEQ     ID NO: 231, SEQ ID NO: 244, SEQ ID NO: 257, SEQ ID NO: 270, SEQ ID     NO: 283, SEQ ID NO: 296, SEQ ID NO: 309, SEQ ID NO: 322, SEQ ID NO:     517, SEQ ID NO: 530, SEQ ID NO: 543, SEQ ID NO: 556, SEQ ID NO: 569,     SEQ ID NO: 582 and SEQ ID NO: 595; and -   (b) as depicted in SEQ ID NO: 10, SEQ ID NO: 335, SEQ ID NO: 348,     SEQ ID NO: 361, SEQ ID NO: 374, SEQ ID NO: 387, SEQ ID NO: 400, SEQ     ID NO: 413, SEQ ID NO: 426, SEQ ID NO: 439, SEQ ID NO: 452, SEQ ID     NO: 465, SEQ ID NO: 478, SEQ ID NO: 491, SEQ ID NO: 504 and SEQ ID     NO: 608.

The above specified first binding domains (specified by their VH regions and VL regions, respectively) classified into group (a) all characterize as binding domains specifically recognizing CDH19 epitope cluster 1, while the above specified first binding domains (specified by their VH regions and VL regions, respectively) classified into group (b) all characterize as binding domains specifically recognizing CDH19 epitope cluster 3.

In another embodiment of the antibody construct of the invention, the first binding domain comprises a VH region and a VL region selected from the group consisting of:

-   (a) pairs of a VH region and a VL region as depicted in SEQ ID NO:     21+23, SEQ ID NO: 34+36, SEQ ID NO: 47+49, SEQ ID NO: 60+62, SEQ ID     NO: 73+75, SEQ ID NO: 86+88, SEQ ID NO: 99+101, SEQ ID NO: 112+114,     SEQ ID NO: 125+127, SEQ ID NO: 138+140, SEQ ID NO: 151+153, SEQ ID     NO: 164+166, SEQ ID NO: 177+179, SEQ ID NO: 190+192, SEQ ID NO:     203+205, SEQ ID NO: 216+218, SEQ ID NO: 229+231, SEQ ID NO: 242+244,     SEQ ID NO: 255+257, SEQ ID NO: 268+270, SEQ ID NO: 281+283, SEQ ID     NO: 294+296, SEQ ID NO: 307+309, SEQ ID NO: 320+322, SEQ ID NO:     515+517, SEQ ID NO: 528+530, SEQ ID NO: 541+543, SEQ ID NO: 554+556,     SEQ ID NO: 567+569, SEQ ID NO: 580+582 and SEQ ID NO: 593+595; and -   (b) pairs of a VH region and a VL region as depicted in SEQ ID NO:     8+10, SEQ ID NO: 333+335, SEQ ID NO: 346+348, SEQ ID NO: 359+361,     SEQ ID NO: 372+374, SEQ ID NO: 385+387, SEQ ID NO: 398+400, SEQ ID     NO: 411+413, SEQ ID NO: 424+426, SEQ ID NO: 437+439, SEQ ID NO:     450+452, SEQ ID NO: 463+465, SEQ ID NO: 476+478, SEQ ID NO: 489+491,     SEQ ID NO: 502+504 and SEQ ID NO: 606+608.

The above specified first binding domains (comprising pairs of a VH region and a VL region) belonging to item or group (a) all characterize as binding domains specifically recognizing CDH19 epitope cluster 1, while the above specified first binding domains (comprising pairs of a VH region and a VL region) belonging to item or group (b) all characterize as binding domains specifically recognizing CDH19 epitope cluster 3.

The term “bispecific” as used herein refers to an antibody construct which is “at least bispecific”, i.e., it comprises at least a first binding domain and a second binding domain, wherein the first binding domain binds to one antigen or target (here: CDH19), and the second binding domain binds to another antigen or target (here: CD3). Accordingly, antibody constructs according to the invention comprise specificities for at least two different antigens or targets. The term “bispecific antibody construct” of the invention also encompasses multispecific antibody constructs such as trispecific antibody constructs, the latter ones including three binding domains, or constructs having more than three (e.g. four, five . . . ) specificities.

Given that the antibody constructs according to the invention are (at least) bispecific, they do not occur naturally and they are markedly different from naturally occurring products. A “bispecific” antibody construct or immunoglobulin is hence an artificial hybrid antibody or immunoglobulin having at least two distinct binding sites with different specificities. Bispecific antibodies can be produced by a variety of methods including fusion of hybridomas or linking of Fab′ fragments. See, e.g., Songsivilai & Lachmann, Clin. Exp. Immunol. 79:315-321 (1990).

The at least two binding domains and the variable domains of the antibody construct of the present invention may or may not comprise peptide linkers (spacer peptides). The term “peptide linker” defines in accordance with the present invention an amino acid sequence by which the amino acid sequences of one (variable and/or binding) domain and another (variable and/or binding) domain of the antibody construct of the invention are linked with each other. An essential technical feature of such peptide linker is that said peptide linker does not comprise any polymerization activity. Among the suitable peptide linkers are those described in U.S. Pat. Nos. 4,751,180 and 4,935,233 or WO 88/09344.

In the event that a linker is used, this linker is preferably of a length and sequence sufficient to ensure that each of the first and second domains can, independently from one another, retain their differential binding specificities. For peptide linkers which connect the at least two binding domains in the antibody construct of the invention (or two variable domains), those peptide linkers are preferred which comprise only a few number of amino acid residues, e.g. 12 amino acid residues or less. Thus, peptide linker of 12, 11, 10, 9, 8, 7, 6 or 5 amino acid residues are preferred. An envisaged peptide linker with less than 5 amino acids comprises 4, 3, 2 or one amino acid(s) wherein Gly-rich linkers are preferred. A particularly preferred “single” amino acid in context of said “peptide linker” is Gly. Accordingly, said peptide linker may consist of the single amino acid Gly. Another preferred embodiment of a peptide linker is characterized by the amino acid sequence Gly-Gly-Gly-Gly-Ser, i.e. Gly4Ser, or polymers thereof, i.e. (Gly4Ser)x, where x is an integer of 1 or greater. The characteristics of said peptide linker, which comprise the absence of the promotion of secondary structures are known in the art and are described e.g. in Dall'Acqua et al. (Biochem. (1998) 37, 9266-9273), Cheadle et al. (Mol Immunol (1992) 29, 21-30) and Raag and Whitlow (FASEB (1995) 9(1), 73-80). Peptide linkers which also do not promote any secondary structures are preferred. The linkage of said domains to each other can be provided by, e.g. genetic engineering, as described in the examples. Methods for preparing fused and operatively linked bispecific single chain constructs and expressing them in mammalian cells or bacteria are well-known in the art (e.g. WO 99/54440 or Sambrook et al., Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N. Y., 2001).

The invention hence provides a preferred embodiment wherein the antibody construct is in a format selected from the group consisting of (scFv)2, scFv-single domain mAb, diabodies and oligomers of any of the afermentioned formats.

According to a particularly preferred embodiment, and as documented in the appended examples, the antibody construct of the invention is a “bispecific single chain antibody construct”, more preferably a bispecific “single chain Fv” (scFv). Although the two domains of the Fv fragment, VL and VH, are coded for by separate genes, they can be joined, using recombinant methods, by a synthetic linker that enables them to be made as a single protein chain in which the VL and VH regions pair to form a monovalent molecule; see e.g., Huston et al. (1988) Proc. Natl. Acad. Sci USA 85:5879-5883). These antibody fragments are obtained using conventional techniques known to those with skill in the art, and the fragments are evaluated for function in the same manner as are whole or full-length antibodies. A single-chain variable fragment (scFv) is hence a fusion protein of the variable region of the heavy chain (VH) and of the light chain (VL) of immunoglobulins, usually connected with a short linker peptide of about ten to about 25 amino acids, preferably about 15 to 20 amino acids. The linker is usually rich in glycine for flexibility, as well as serine or threonine for solubility, and can either connect the N-terminus of the VH with the C-terminus of the VL, or vice versa. This protein retains the specificity of the original immunoglobulin, despite removal of the constant regions and introduction of the linker.

Bispecific single chain molecules are known in the art and are described in WO 99/54440, Mack, J. Immunol. (1997), 158, 3965-3970, Mack, PNAS, (1995), 92, 7021-7025, Kufer, Cancer Immunol. Immunother., (1997), 45, 193-197, Löffler, Blood, (2000), 95, 6, 2098-2103, Brühl, Immunol., (2001), 166, 2420-2426, Kipriyanov, J. Mol. Biol., (1999), 293, 41-56. Techniques described for the production of single chain antibodies (see, inter alia, U.S. Pat. No. 4,946,778, Kontermann and Diibel (2010), loc. cit. and Little (2009), loc. cit.) can be adapted to produce single chain antibody constructs specifically recognizing (an) elected target(s).

Bivalent (also called divalent) or bispecific single-chain variable fragments (bi-scFvs or di-scFvs having the format (scFv)2) can be engineered by linking two scFv molecules. If these two scFv molecules have the same binding specificity, the resulting (scFv)2 molecule will preferably be called bivalent (i.e. it has two valences for the same target epitope). If the two scFv molecules have different binding specificities, the resulting (scFv)2 molecule will preferably be called bispecific. The linking can be done by producing a single peptide chain with two VH regions and two VL regions, yielding tandem scFvs (see e.g. Kufer P. et al., (2004) Trends in Biotechnology 22(5):238-244). Another possibility is the creation of scFv molecules with linker peptides that are too short for the two variable regions to fold together (e.g. about five amino acids), forcing the scFvs to dimerize. This type is known as diabodies (see e.g. Hollinger, Philipp et al., (July 1993) Proceedings of the National Academy of Sciences of the United States of America 90 (14): 6444-8.).

Single domain antibodies comprise merely one (monomeric) antibody variable domain which is able to bind selectively to a specific antigen, independently of other V regions or domains. The first single domain antibodies were engineered from heavy chain antibodies found in camelids, and these are called VHH fragments. Cartilaginous fishes also have heavy chain antibodies (IgNAR) from which single domain antibodies called VNAR fragments can be obtained. An alternative approach is to split the dimeric variable domains from common immunoglobulins e.g. from humans or rodents into monomers, hence obtaining VH or VL as a single domain Ab. Although most research into single domain antibodies is currently based on heavy chain variable domains, nanobodies derived from light chains have also been shown to bind specifically to target epitopes. Examples of single domain antibodies are called sdAb, nanobodies or single variable domain antibodies.

A (single domain mAb)2 is hence a monoclonal antibody construct composed of (at least) two single domain monoclonal antibodies, which are individually selected from the group comprising VH, VL, VHH and VNAR. The linker is preferably in the form of a peptide linker. Similarly, an “scFv-single domain mAb” is a monoclonal antibody construct composed of at least one single domain antibody as described above and one scFv molecule as described above. Again, the linker is preferably in the form of a peptide linker.

In one embodiment, the first binding domain comprises an amino acid sequence selected from the group consisting of those sequences as depicted in:

-   (a) SEQ ID NO: 25, SEQ ID NO: 38, SEQ ID NO: 51, SEQ ID NO: 64, SEQ     ID NO: 77, SEQ ID NO: 90, SEQ ID NO: 103, SEQ ID NO: 116, SEQ ID NO:     129, SEQ ID NO: 142, SEQ ID NO: 155, SEQ ID NO: 168, SEQ ID NO: 181,     SEQ ID NO: 194, SEQ ID NO: 207, SEQ ID NO: 220, SEQ ID NO: 233, SEQ     ID NO: 246, SEQ ID NO: 259, SEQ ID NO: 272, SEQ ID NO: 285, SEQ ID     NO: 298, SEQ ID NO: 311, SEQ ID NO: 324, SEQ ID NO: 519, SEQ ID NO:     532, SEQ ID NO: 545, SEQ ID NO: 558, SEQ ID NO: 571, SEQ ID NO: 584     and SEQ ID NO: 597; and -   (b) SEQ ID NO: 12, SEQ ID NO: 337, SEQ ID NO: 350, SEQ ID NO: 363,     SEQ ID NO: 376, SEQ ID NO: 389, SEQ ID NO: 402, SEQ ID NO: 415, SEQ     ID NO: 428, SEQ ID NO: 441, SEQ ID NO: 454, SEQ ID NO: 467, SEQ ID     NO: 480, SEQ ID NO: 493, SEQ ID NO: 506 and SEQ ID NO: 610.

The above specified first binding domains belonging to item or group (a) all characterize as binding domains specifically recognizing CDH19 epitope cluster 1, while the above specified first binding domains belonging to item or group (b) all characterize as binding domains specifically recognizing CDH19 epitope cluster 3.

It is also envisaged that the antibody construct of the invention has, in addition to its function to bind to the target molecules CDH19 and CD3, a further function. In this format, the antibody construct is a trifunctional or multifunctional antibody construct by targeting target cells through binding to CDH19, mediating cytotoxic T cell activity through CD3 binding and providing a further function such as a fully functional Fc constant domain mediating antibody-dependent cellular cytotoxicity through recruitment of effector cells like NK cells, a label (fluorescent etc.), a therapeutic agent such as a toxin or radionuclide, and/or means to enhance serum half-life, etc.

Examples for means to extend serum half-life of the antibody constructs of the invention include peptides protein domains of proteins, which are fused or otherwise attached to the antibody constructs. The groupe of peptides includes peptides binding to other preoteins with preferred pharmacokinetic profile in the human body such as serum albunin (see the AB156 peptide used in some constructs of the invention) or the constant region of immunoglobulins (Fc domains). An alternatively used concept of such half-life extending peptides includes peptides binding to the neonatal Fc receptor (FcRn), which are also used in some of the constructs of the invention. The concept of attaching larger domains of proteins or complete proteins includes e.g. the fusion of human serum albumin, variants of human serum albumin (see WO 2014/072481) or domains thereof as well as the fusion of constant region of immunoglobulins (Fc domains) and variants thereof. Such variants of Fc domains may be optimized/modified in order to allow the desired pairing of dimers or mulimers, to abolish Fc receptor binding (e.g. th Fc□ receptor) or for other reasons. A further concept known in the art to extend the half-life of small protein compounds in the human body is the pegylation of those compounds such as the antibody construct of the invention.

Covalent modifications of the antibody constructs are also included within the scope of this invention, and are generally, but not always, done post-translationally. For example, several types of covalent modifications of the antibody construct are introduced into the molecule by reacting specific amino acid residues of the antibody construct with an organic derivatizing agent that is capable of reacting with selected side chains or the N- or C-terminal residues.

Cysteinyl residues most commonly are reacted with α-haloacetates (and corresponding amines), such as chloroacetic acid or chloroacetamide, to give carboxymethyl or carboxyamidomethyl derivatives. Cysteinyl residues also are derivatized by reaction with bromotrifluoroacetone, α-bromo-β-(5-imidozoyl)propionic acid, chloroacetyl phosphate, N-alkylmaleimides, 3-nitro-2-pyridyl disulfide, methyl 2-pyridyl disulfide, p-chloromercuribenzoate, 2-chloromercuri-4-nitrophenol, or chloro-7-nitrobenzo-2-oxa-1,3-diazole.

Histidyl residues are derivatized by reaction with diethylpyrocarbonate at pH 5.5-7.0 because this agent is relatively specific for the histidyl side chain. Para-bromophenacyl bromide also is useful; the reaction is preferably performed in 0.1 M sodium cacodylate at pH 6.0. Lysinyl and amino terminal residues are reacted with succinic or other carboxylic acid anhydrides. Derivatization with these agents has the effect of reversing the charge of the lysinyl residues. Other suitable reagents for derivatizing alpha-amino-containing residues include imidoesters such as methyl picolinimidate; pyridoxal phosphate; pyridoxal; chloroborohydride; trinitrobenzenesulfonic acid; O-methylisourea; 2,4-pentanedione; and transaminase-catalyzed reaction with glyoxylate.

Arginyl residues are modified by reaction with one or several conventional reagents, among them phenylglyoxal, 2,3-butanedione, 1,2-cyclohexanedione, and ninhydrin. Derivatization of arginine residues requires that the reaction be performed in alkaline conditions because of the high pKa of the guanidine functional group. Furthermore, these reagents may react with the groups of lysine as well as the arginine epsilon-amino group.

The specific modification of tyrosyl residues may be made, with particular interest in introducing spectral labels into tyrosyl residues by reaction with aromatic diazonium compounds or tetranitromethane. Most commonly, N-acetylimidizole and tetranitromethane are used to form O-acetyl tyrosyl species and 3-nitro derivatives, respectively. Tyrosyl residues are iodinated using 125I or 131I to prepare labeled proteins for use in radioimmunoassay, the chloramine T method described above being suitable.

Carboxyl side groups (aspartyl or glutamyl) are selectively modified by reaction with carbodiimides (R′—N═C═N—R′), where R and R′ are optionally different alkyl groups, such as 1-cyclohexyl-3-(2-morpholinyl-4-ethyl) carbodiimide or 1-ethyl-3-(4-azonia-4,4-dimethylpentyl) carbodiimide. Furthermore, aspartyl and glutamyl residues are converted to asparaginyl and glutaminyl residues by reaction with ammonium ions.

Derivatization with bifunctional agents is useful for crosslinking the antibody constructs of the present invention to a water-insoluble support matrix or surface for use in a variety of methods. Commonly used crosslinking agents include, e.g., 1,1-bis(diazoacetyl)-2-phenylethane, glutaraldehyde, N-hydroxysuccinimide esters, for example, esters with 4-azidosalicylic acid, homobifunctional imidoesters, including disuccinimidyl esters such as 3,3′-dithiobis(succinimidylpropionate), and bifunctional maleimides such as bis-N-maleimido-1,8-octane. Derivatizing agents such as methyl-3-[(p-azidophenyl)dithio]propioimidate yield photoactivatable intermediates that are capable of forming crosslinks in the presence of light. Alternatively, reactive water-insoluble matrices such as cyanogen bromide-activated carbohydrates and the reactive substrates described in U.S. Pat. Nos. 3,969,287; 3,691,016; 4,195,128; 4,247,642; 4,229,537; and 4,330,440 are employed for protein immobilization.

Glutaminyl and asparaginyl residues are frequently deamidated to the corresponding glutamyl and aspartyl residues, respectively. Alternatively, these residues are deamidated under mildly acidic conditions. Either form of these residues falls within the scope of this invention.

Other modifications include hydroxylation of proline and lysine, phosphorylation of hydroxyl groups of seryl or threonyl residues, methylation of the ?-amino groups of lysine, arginine, and histidine side chains (T. E. Creighton, Proteins: Structure and Molecular Properties, W. H. Freeman & Co., San Francisco, 1983, pp. 79-86), acetylation of the N-terminal amine, and amidation of any C-terminal carboxyl group.

Another type of covalent modification of the antibody constructs included within the scope of this invention comprises altering the glycosylation pattern of the protein. As is known in the art, glycosylation patterns can depend on both the sequence of the protein (e.g., the presence or absence of particular glycosylation amino acid residues, discussed below), or the host cell or organism in which the protein is produced. Particular expression systems are discussed below.

Glycosylation of polypeptides is typically either N-linked or O-linked. N-linked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue. The tri-peptide sequences asparagine-X-serine and asparagine-X-threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain. Thus, the presence of either of these tri-peptide sequences in a polypeptide creates a potential glycosylation site. O-linked glycosylation refers to the attachment of one of the sugars N-acetylgalactosamine, galactose, or xylose, to a hydroxyamino acid, most commonly serine or threonine, although 5-hydroxyproline or 5-hydroxylysine may also be used.

Addition of glycosylation sites to the antibody construct is conveniently accomplished by altering the amino acid sequence such that it contains one or more of the above-described tri-peptide sequences (for N-linked glycosylation sites). The alteration may also be made by the addition of, or substitution by, one or more serine or threonine residues to the starting sequence (for O-linked glycosylation sites). For ease, the amino acid sequence of an antibody construct is preferably altered through changes at the DNA level, particularly by mutating the DNA encoding the polypeptide at preselected bases such that codons are generated that will translate into the desired amino acids.

Another means of increasing the number of carbohydrate moieties on the antibody construct is by chemical or enzymatic coupling of glycosides to the protein. These procedures are advantageous in that they do not require production of the protein in a host cell that has glycosylation capabilities for N- and O-linked glycosylation. Depending on the coupling mode used, the sugar(s) may be attached to (a) arginine and histidine, (b) free carboxyl groups, (c) free sulfhydryl groups such as those of cysteine, (d) free hydroxyl groups such as those of serine, threonine, or hydroxyproline, (e) aromatic residues such as those of phenylalanine, tyrosine, or tryptophan, or (f) the amide group of glutamine. These methods are described in WO 87/05330, and in Aplin and Wriston, 1981, CRC Crit. Rev. Biochem., pp. 259-306.

Removal of carbohydrate moieties present on the starting antibody construct may be accomplished chemically or enzymatically. Chemical deglycosylation requires exposure of the protein to the compound trifluoromethanesulfonic acid, or an equivalent compound. This treatment results in the cleavage of most or all sugars except the linking sugar (N-acetylglucosamine or N-acetylgalactosamine), while leaving the polypeptide intact. Chemical deglycosylation is described by Hakimuddin et al., 1987, Arch. Biochem. Biophys. 259:52 and by Edge et al., 1981, Anal. Biochem. 118:131. Enzymatic cleavage of carbohydrate moieties on polypeptides can be achieved by the use of a variety of endo- and exo-glycosidases as described by Thotakura et al., 1987, Meth. Enzymol. 138:350. Glycosylation at potential glycosylation sites may be prevented by the use of the compound tunicamycin as described by Duskin et al., 1982, J. Biol. Chem. 257:3105. Tunicamycin blocks the formation of protein-N-glycoside linkages.

Other modifications of the antibody construct are contemplated herein. For example, another type of covalent modification of the antibody construct comprises linking the antibody construct to various non-proteinaceous polymers, including, but not limited to, various polyols such as polyethylene glycol, polypropylene glycol, polyoxyalkylenes, or copolymers of polyethylene glycol and polypropylene glycol, in the manner set forth in U.S. Pat. Nos. 4,640,835; 4,496,689; 4,301,144; 4,670,417; 4,791,192 or 4,179,337. In addition, as is known in the art, amino acid substitutions may be made in various positions within the antibody construct, e.g. in order to facilitate the addition of polymers such as PEG.

In some embodiments, the covalent modification of the antibody constructs of the invention comprises the addition of one or more labels. The labelling group may be coupled to the antibody construct via spacer arms of various lengths to reduce potential steric hindrance. Various methods for labelling proteins are known in the art and can be used in performing the present invention. The term “label” or “labelling group” refers to any detectable label. In general, labels fall into a variety of classes, depending on the assay in which they are to be detected—the following examples include, but are not limited to:

-   -   a) isotopic labels, which may be radioactive or heavy isotopes,         such as radioisotopes or radionuclides (e.g., 3H, 14C, 15N, 35S,         89Zr, 90Y, 99Tc, 111In, 125I, 131I)     -   b) magnetic labels (e.g., magnetic particles)     -   c) redox active moieties     -   d) optical dye (including, but not limited to, chromophores,         phosphors and fluorophores) such as fluorescent groups (e.g.,         FITC, rhodamine, lanthanide phosphors), chemiluminescent groups,         and fluorophores which can be either “small molecule” fluores or         proteinaceous fluores     -   e) enzymatic groups (e.g. horseradish peroxidase,         ?-galactosidase, luciferase, alkaline phosphatase)     -   f) biotinylated groups     -   g) predetermined polypeptide epitopes recognized by a secondary         reporter (e.g., leucine zipper pair sequences, binding sites for         secondary antibodies, metal binding domains, epitope tags, etc.)

By “fluorescent label” is meant any molecule that may be detected via its inherent fluorescent properties. Suitable fluorescent labels include, but are not limited to, fluorescein, rhodamine, tetramethylrhodamine, eosin, erythrosin, coumarin, methyl-coumarins, pyrene, Malacite green, stilbene, Lucifer Yellow, Cascade BlueJ, Texas Red, IAEDANS, EDANS, BODIPY FL, LC Red 640, Cy 5, Cy 5.5, LC Red 705, Oregon green, the Alexa-Fluor dyes (Alexa Fluor 350, Alexa Fluor 430, Alexa Fluor 488, Alexa Fluor 546, Alexa Fluor 568, Alexa Fluor 594, Alexa Fluor 633, Alexa Fluor 660, Alexa Fluor 680), Cascade Blue, Cascade Yellow and R-phycoerythrin (PE) (Molecular Probes, Eugene, Oreg.), FITC, Rhodamine, and Texas Red (Pierce, Rockford, Ill.), Cy5, Cy5.5, Cy7 (Amersham Life Science, Pittsburgh, Pa.). Suitable optical dyes, including fluorophores, are described in Molecular Probes Handbook by Richard P. Haugland.

Suitable proteinaceous fluorescent labels also include, but are not limited to, green fluorescent protein, including a Renilla, Ptilosarcus, or Aequorea species of GFP (Chalfie et al., 1994, Science 263:802-805), EGFP (Clontech Laboratories, Inc., Genbank Accession Number U55762), blue fluorescent protein (BFP, Quantum Biotechnologies, Inc. 1801 de Maisonneuve Blvd. West, 8th Floor, Montreal, Quebec, Canada H3H 1J9; Stauber, 1998, Biotechniques 24:462-471; Heim et al., 1996, Curr. Biol. 6:178-182), enhanced yellow fluorescent protein (EYFP, Clontech Laboratories, Inc.), luciferase (Ichiki et al., 1993, J. Immunol. 150:5408-5417), ? galactosidase (Nolan et al., 1988, Proc. Natl. Acad. Sci. U.S.A. 85:2603-2607) and Renilla (WO92/15673, WO95/07463, WO98/14605, WO98/26277, WO99/49019, U.S. Pat. Nos. 5,292,658, 5,418,155, 5,683,888, 5,741,668, 5,777,079, 5,804,387, 5,874,304, 5,876,995, 5,925,558).

Leucine zipper domains are peptides that promote oligomerization of the proteins in which they are found. Leucine zippers were originally identified in several DNA-binding proteins (Landschulz et al., 1988, Science 240:1759), and have since been found in a variety of different proteins. Among the known leucine zippers are naturally occurring peptides and derivatives thereof that dimerize or trimerize. Examples of leucine zipper domains suitable for producing soluble oligomeric proteins are described in PCT application WO 94/10308, and the leucine zipper derived from lung surfactant protein D (SPD) described in Hoppe et al., 1994, FEBS Letters 344:191. The use of a modified leucine zipper that allows for stable trimerization of a heterologous protein fused thereto is described in Fanslow et al., 1994, Semin. Immunol. 6:267-78. In one approach, recombinant fusion proteins comprising CDH19 antibody fragment or derivative fused to a leucine zipper peptide are expressed in suitable host cells, and the soluble oligomeric CDH19 antibody fragments or derivatives that form are recovered from the culture supernatant.

The antibody construct of the invention may also comprise additional domains, which are e.g. helpful in the isolation of the molecule or relate to an adapted pharmacokinetic profile of the molecule. Domains helpful for the isolation of an antibody construct may be selected from peptide motives or secondarily introduced moieties, which can be captured in an isolation method, e.g. an isolation column. Non-limiting embodiments of such additional domains comprise peptide motives known as Myc-tag, HAT-tag, HA-tag, TAP-tag, GST-tag, chitin binding domain (CBD-tag), maltose binding protein (MBP-tag), Flag-tag, Strep-tag and variants thereof (e.g. StrepII-tag) and His-tag. All herein disclosed antibody constructs characterized by the identified CDRs are preferred to comprise a His-tag domain, which is generally known as a repeat of consecutive His residues in the amino acid sequence of a molecule, preferably of six His residues.

The first binding domain of the antibody construct of the present invention binds to human CDH19 on the surface of a target cell. The amino acid sequence of human CDH19 is represented by SEQ ID NO: 1834. It is understood that the term “on the surface” means in the context of the present invention that the binding domain specifically binds to an epitope or epitope cluster comprised within the CDH19 extracellular domain (CDH19 ECD). The first binding domain according to the invention hence preferably binds to CDH19 when it is expressed by naturally expressing cells or cell lines, and/or by cells or cell lines transformed or (stably/transiently) transfected with CDH19. In a preferred embodiment the first binding domain also binds to CDH19 when CDH19 is used as a “target” or “ligand” molecule in an in vitro binding assay such as BIAcore or Scatchard. The “target cell” can be any prokaryotic or eukaryotic cell expressing CDH19 on its surface; preferably the target cell is a cell that is part of the human or animal body, such as a melanoma cell.

The term “CDH19 ECD” refers to a form of CDH19 which is essentially free of transmembrane and cytoplasmic domains of CDH19. It will be understood by the skilled artisan that the transmembrane domain identified for the CDH19 polypeptide of the present invention is identified pursuant to criteria routinely employed in the art for identifying that type of hydrophobic domain. The exact boundaries of a transmembrane domain may vary but most likely by no more than about 5 amino acids at either end of the domain specifically mentioned herein. A preferred human CDH19 ECD is shown in SEQ ID NO: 1836.

The affinity of the first binding domain for human CDH19 is preferably ?15 nM, more preferably ? 10 nM, even more preferably ?5 nM, even more preferably ?1 nM, even more preferably ?0.5 nM, even more preferably ?0.1 nM, and most preferably ?0.05 nM. The affinity can be measured for example in a BIAcore assay or in a Scatchard assay, e.g. as described in the Examples. Other methods of determining the affinity are well-known to the skilled person.

T cells or T lymphocytes are a type of lymphocyte (itself a type of white blood cell) that play a central role in cell-mediated immunity. There are several subsets of T cells, each with a distinct function. T cells can be distinguished from other lymphocytes, such as B cells and NK cells, by the presence of a T cell receptor (TCR) on the cell surface. The TCR is responsible for recognizing antigens bound to major histocompatibility complex (MHC) molecules and is composed of two different protein chains. In 95% of the T cells, the TCR consists of an alpha (?) and beta (?) chain. When the TCR engages with antigenic peptide and MHC (peptide/MHC complex), the T lymphocyte is activated through a series of biochemical events mediated by associated enzymes, co-receptors, specialized adaptor molecules, and activated or released transcription factors

The CD3 receptor complex is a protein complex and is composed of four chains. In mammals, the complex contains a CD3? (gamma) chain, a CD3? (delta) chain, and two CD3? (epsilon) chains. These chains associate with the T cell receptor (TCR) and the so-called ? (zeta) chain to form the T cell receptor CD3 complex and to generate an activation signal in T lymphocytes. The CD3? (gamma), CD3? (delta), and CD3? (epsilon) chains are highly related cell-surface proteins of the immunoglobulin superfamily containing a single extracellular immunoglobulin domain. The intracellular tails of the CD3 molecules contain a single conserved motif known as an immunoreceptor tyrosine-based activation motif or ITAM for short, which is essential for the signaling capacity of the TCR. The CD3 epsilon molecule is a polypeptide which in humans is encoded by the CD3E gene which resides on chromosome 11. The sequence of a preferred human CD3 epsilon extracellular domain is shown in SEQ ID NO: 1844, and the most preferred CD3 binding epitope corresponding to amino acid residues 1-27 of the human CD3 epsilon extracellular domain is represented in SEQ ID NO: 1845.

The redirected lysis of target cells via the recruitment of T cells by a multispecific, at least bispecific, antibody construct involves cytolytic synapse formation and delivery of perforin and granzymes. The engaged T cells are capable of serial target cell lysis, and are not affected by immune escape mechanisms interfering with peptide antigen processing and presentation, or clonal T cell differentiation; see, for example, WO 2007/042261.

Cytotoxicity mediated by CDH19/CD3 bispecific antibody constructs can be measured in various ways. Effector cells can be e.g. stimulated enriched (human) CD8 positive T cells or unstimulated (human) peripheral blood mononuclear cells (PBMC). If the target cells are of macaque origin or express or are transfected with macaque CDH19, the effector cells should also be of macaque origin such as a macaque T cell line, e.g. 4119LnPx. The target cells should express (at least the extracellular domain of) CDH19, e.g. human or macaque CDH19. Target cells can be a cell line (such as CHO) which is stably or transiently transfected with CDH19, e.g. human or macaque CDH19. Alternatively, the target cells can be a CDH19 positive natural expresser cell line, such as the human myeloma cell line CHL-1 or Colo-699. Usually EC50 values are expected to be lower with target cell lines expressing higher levels of CDH19 on the cell surface. The effector to target cell (E:T) ratio is usually about 10:1, but can also vary. Cytotoxic activity of CDH19/CD3 bispecific antibody constructs can be measured in a 51-chromium release assay (incubation time of about 18 hours) or in a in a FACS-based cytotoxicity assay (incubation time of about 48 hours). Modifications of the assay incubation time (cytotoxic reaction) are also possible. Other methods of measuring cytotoxicity are well-known to the skilled person and comprise MTT or MTS assays, ATP-based assays including bioluminescent assays, the sulforhodamine B (SRB) assay, WST assay, clonogenic assay and the ECIS technology.

The cytotoxic activity mediated by CDH19/CD3 bispecific antibody constructs of the present invention is preferably measured in a cell-based cytotoxicity assay. It is represented by the EC50 value, which corresponds to the half maximal effective concentration (concentration of the antibody construct which induces a cytotoxic response halfway between the baseline and maximum). Preferably, the EC50 value of the CDH19/CD3 bispecific antibody constructs is ?20.000 pg/ml, more preferably ?5000 pg/ml, even more preferably ?1000 pg/ml, even more preferably ?500 pg/ml, even more preferably ?350 pg/ml, even more preferably ?250 pg/ml, even more preferably ? 100 pg/ml, even more preferably ?50 pg/ml, even more preferably ?10 pg/ml, and most preferably ?5 pg/ml.

Any of the above given EC50 values can be combined with any one of the indicated scenarios of a cell-based cytotoxicity assay. For example, when (human) CD8 positive T cells or a macaque T cell line are used as effector cells, the EC50 value of the CDH19/CD3 bispecific antibody construct is preferably ?1000 pg/ml, more preferably ?500 pg/ml, even more preferably ?250 pg/ml, even more preferably ? 100 pg/ml, even more preferably ?50 pg/ml, even more preferably ? 10 pg/ml, and most preferably ?5 pg/ml. If in this assay the target cells are (human or macaque) CDH19 transfected cells such as CHO cells, the EC50 value of the CDH19/CD3 bispecific antibody construct is preferably ?150 pg/ml, more preferably ? 100 pg/ml, even more preferably ?50 pg/ml, even more preferably ?30 pg/ml, even more preferably ?10 pg/ml, and most preferably ?5 pg/ml. If the target cells are a CDH19 positive natural expresser cell line, then the EC50 value is preferably ?350 pg/ml, more preferably ?250 pg/ml, even more preferably ?200 pg/ml, even more preferably ?100 pg/ml, even more preferably ?150 pg/ml, even more preferably ?100 pg/ml, and most preferably ?50 pg/ml, or lower. When (human) PBMCs are used as effector cells, the EC50 value of the CDH19/CD3 bispecific antibody construct is preferably ?1000 pg/ml, more preferably ?750 pg/ml, more preferably ?500 pg/ml, even more preferably ?350 pg/ml, even more preferably ?250 pg/ml, even more preferably ?100 pg/ml, and most preferably ?50 pg/ml, or lower.

Preferably, the CDH19/CD3 bispecific antibody constructs of the present invention do not induce/mediate lysis or do not essentially induce/mediate lysis of CDH19 negative cells such as CHO cells. The term “do not induce lysis”, “do not essentially induce lysis”, “do not mediate lysis” or “do not essentially mediate lysis” means that an antibody constructs of the present invention does not induce or mediate lysis of more than 30%, preferably not more than 20%, more preferably not more than 10%, particularly preferably not more than 9%, 8%, 7%, 6% or 5% of CDH19 negative cells, whereby lysis of a CDH19 positive cell line such as CHL-1 or Colo-699 is set to be 100%. This usually applies for concentrations of the antibody construct of up to 500 nM. The skilled person knows how to measure cell lysis without further ado. Moreover, the present specification teaches specific instructions how to measure cell lysis.

The difference in cytotoxic activity between the monomeric and the dimeric isoform of individual CDH19/CD3 bispecific antibody constructs is referred to as “potency gap”. This potency gap can e.g. be calculated as ratio between EC50 values of the molecule's monomeric and dimeric form. Potency gaps of the CDH19/CD3 bispecific antibody constructs of the present invention are preferably ? 5, more preferably ? 4, even more preferably ? 3, even more preferably ? 2 and most preferably ? 1.

The first and/or the second (or any further) binding domain(s) of the antibody construct of the invention is/are preferably cross-species specific for members of the mammalian order of primates. Cross-species specific CD3 binding domains are, for example, described in WO 2008/119567. According to one embodiment, the first and/or second binding domain, in addition to binding to human CDH19 and human CD3, respectively, will also bind to CDH19/CD3 of primates including (but not limited to) new world primates (such as Callithrix jacchus, Saguinus Oedipus or Saimiri sciureus), old world primates (such baboons and macaques), gibbons, and non-human homininae.

In one aspect of the invention, the first binding domain binds to human CDH19 and further binds to macaque CDH19, such as CDH19 of Macaca fascicularis (SEQ ID NO: 1835). The affinity of the first binding domain for macaque CDH19 is preferably ?15 nM, more preferably ? 10 nM, even more preferably ?5 nM, even more preferably ?1 nM, even more preferably ?0.5 nM, even more preferably ?0.1 nM, and most preferably ?0.05 nM or even ?0.01 nM.

Preferably the affinity gap of the antibody constructs according to the invention for binding macaque CDH19 versus human CDH19 [maCDH19:huCDH19] is between 0.1 and 10, more preferably between 0.2 and 5, even more preferably between 0.3 and 2.5, even more preferably between 0.4 and 2, and most preferably between 0.5 and 1.

In one embodiment of the antibody construct of the invention, the second binding domain binds to human and Callithrix jacchus, Saguinus Oedipus or Saimiri sciureus CD3 epsilon. Callithrix jacchus and Saguinus oedipus are both new world primate belonging to the family of Callitrichidae, while Saimiri sciureus is a new world primate belonging to the family of Cebidae.

It is particularly preferred for the antibody construct of the present invention that the second binding domain which binds to human CD3 on the surface of a T cell comprises a VL region comprising CDR-L1, CDR-L2 and CDR-L3 selected from:

-   (a) CDR-L1 as depicted in SEQ ID NO: 27 of WO 2008/119567, CDR-L2 as     depicted in SEQ ID NO: 28 of WO 2008/119567 and CDR-L3 as depicted     in SEQ ID NO: 29 of WO 2008/119567; -   (b) CDR-L1 as depicted in SEQ ID NO: 117 of WO 2008/119567, CDR-L2     as depicted in SEQ ID NO: 118 of WO 2008/119567 and CDR-L3 as     depicted in SEQ ID NO: 119 of WO 2008/119567; and -   (c) CDR-L1 as depicted in SEQ ID NO: 153 of WO 2008/119567, CDR-L2     as depicted in SEQ ID NO: 154 of WO 2008/119567 and CDR-L3 as     depicted in SEQ ID NO: 155 of WO 2008/119567.

In an alternatively preferred embodiment of the antibody construct of the present invention, the second binding domain which binds to human CD3 on the surface of a T cell comprises a VH region comprising CDR-H 1, CDR-H2 and CDR-H3 selected from:

-   (a) CDR-H1 as depicted in SEQ ID NO: 12 of WO 2008/119567, CDR-H2 as     depicted in SEQ ID NO: 13 of WO 2008/119567 and CDR-H3 as depicted     in SEQ ID NO: 14 of WO 2008/119567; -   (b) CDR-H1 as depicted in SEQ ID NO: 30 of WO 2008/119567, CDR-H2 as     depicted in SEQ ID NO: 31 of WO 2008/119567 and CDR-H3 as depicted     in SEQ ID NO: 32 of WO 2008/119567; -   (c) CDR-H1 as depicted in SEQ ID NO: 48 of WO 2008/119567, CDR-H2 as     depicted in SEQ ID NO: 49 of WO 2008/119567 and CDR-H3 as depicted     in SEQ ID NO: 50 of WO 2008/119567; -   (d) CDR-H1 as depicted in SEQ ID NO: 66 of WO 2008/119567, CDR-H2 as     depicted in SEQ ID NO: 67 of WO 2008/119567 and CDR-H3 as depicted     in SEQ ID NO: 68 of WO 2008/119567; -   (e) CDR-H1 as depicted in SEQ ID NO: 84 of WO 2008/119567, CDR-H2 as     depicted in SEQ ID NO: 85 of WO 2008/119567 and CDR-H3 as depicted     in SEQ ID NO: 86 of WO 2008/119567; -   (f) CDR-H1 as depicted in SEQ ID NO: 102 of WO 2008/119567, CDR-H2     as depicted in SEQ ID NO: 103 of WO 2008/119567 and CDR-H3 as     depicted in SEQ ID NO: 104 of WO 2008/119567; -   (g) CDR-H1 as depicted in SEQ ID NO: 120 of WO 2008/119567, CDR-H2     as depicted in SEQ ID NO: 121 of WO 2008/119567 and CDR-H3 as     depicted in SEQ ID NO: 122 of WO 2008/119567; -   (h) CDR-H1 as depicted in SEQ ID NO: 138 of WO 2008/119567, CDR-H2     as depicted in SEQ ID NO: 139 of WO 2008/119567 and CDR-H3 as     depicted in SEQ ID NO: 140 of WO 2008/119567; -   (i) CDR-H1 as depicted in SEQ ID NO: 156 of WO 2008/119567, CDR-H2     as depicted in SEQ ID NO: 157 of WO 2008/119567 and CDR-H3 as     depicted in SEQ ID NO: 158 of WO 2008/119567; and -   (j) CDR-H1 as depicted in SEQ ID NO: 174 of WO 2008/119567, CDR-H2     as depicted in SEQ ID NO: 175 of WO 2008/119567 and CDR-H3 as     depicted in SEQ ID NO: 176 of WO 2008/119567.

It is further preferred for the antibody construct of the present invention that the second binding domain which binds to human CD3 on the surface of a T cell comprises a VL region selected from the group consisting of a VL region as depicted in SEQ ID NO: 35, 39, 125, 129, 161 or 165 of WO 2008/119567.

It is alternatively preferred that the second binding domain which binds to human CD3 on the surface of a T cell comprises a VH region selected from the group consisting of a VH region as depicted in SEQ ID NO: 15, 19, 33, 37, 51, 55, 69, 73, 87, 91, 105, 109, 123, 127, 141, 145, 159, 163, 177 or 181 of WO 2008/119567.

More preferably, the antibody construct of the present invention is characterized by the second binding domain which binds to human CD3 on the surface of a T cell comprising a VL region and a VH region selected from the group consisting of:

-   (a) a VL region as depicted in SEQ ID NO: 17 or 21 of WO 2008/119567     and a VH region as depicted in SEQ ID NO: 15 or 19 of WO     2008/119567; -   (b) a VL region as depicted in SEQ ID NO: 35 or 39 of WO 2008/119567     and a VH region as depicted in SEQ ID NO: 33 or 37 of WO     2008/119567; -   (c) a VL region as depicted in SEQ ID NO: 53 or 57 of WO 2008/119567     and a VH region as depicted in SEQ ID NO: 51 or 55 of WO     2008/119567; -   (d) a VL region as depicted in SEQ ID NO: 71 or 75 of WO 2008/119567     and a VH region as depicted in SEQ ID NO: 69 or 73 of WO     2008/119567; -   (e) a VL region as depicted in SEQ ID NO: 89 or 93 of WO 2008/119567     and a VH region as depicted in SEQ ID NO: 87 or 91 of WO     2008/119567; -   (f) a VL region as depicted in SEQ ID NO: 107 or 111 of WO     2008/119567 and a VH region as depicted in SEQ ID NO: 105 or 109 of     WO 2008/119567; -   (g) a VL region as depicted in SEQ ID NO: 125 or 129 of WO     2008/119567 and a VH region as depicted in SEQ ID NO: 123 or 127 of     WO 2008/119567; -   (h) a VL region as depicted in SEQ ID NO: 143 or 147 of WO     2008/119567 and a VH region as depicted in SEQ ID NO: 141 or 145 of     WO 2008/119567; -   (i) a VL region as depicted in SEQ ID NO: 161 or 165 of WO     2008/119567 and a VH region as depicted in SEQ ID NO: 159 or 163 of     WO 2008/119567; and -   (j) a VL region as depicted in SEQ ID NO: 179 or 183 of WO     2008/119567 and a VH region as depicted in SEQ ID NO: 177 or 181 of     WO 2008/119567.

According to a preferred embodiment of the antibody construct of the present invention, the binding domains and in particular the second binding domain (which binds to human CD3 on the surface of a T cell) have the following format: The pairs of VH regions and VL regions are in the format of a single chain antibody (scFv). The VH and VL regions are arranged in the order VH-VL or VL-VH. It is preferred that the VH-region is positioned N-terminally to a linker sequence, and the VL-region is positioned C-terminally of the linker sequence.

A preferred embodiment of the above described antibody construct of the present invention is characterized by the second binding domain which binds to human CD3 on the surface of a T cell comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 23, 25, 41, 43, 59, 61, 77, 79, 95, 97, 113, 115, 131, 133, 149, 151, 167, 169, 185 or 187 of WO 2008/119567.

In one embodiment of the present invention, the antibody construct has an amino acid sequence selected from the group consisting of those sequences as depicted in

-   (a) SEQ ID NO: 26, SEQ ID NO: 39, SEQ ID NO: 52, SEQ ID NO: 65, SEQ     ID NO: 78, SEQ ID NO: 91, SEQ ID NO: 104, SEQ ID NO: 117, SEQ ID NO:     130, SEQ ID NO: 143, SEQ ID NO: 156, SEQ ID NO: 169, SEQ ID NO: 182,     SEQ ID NO: 195, SEQ ID NO: 208, SEQ ID NO: 221, SEQ ID NO: 234, SEQ     ID NO: 247, SEQ ID NO: 260, SEQ ID NO: 273, SEQ ID NO: 286, SEQ ID     NO: 299, SEQ ID NO: 312, SEQ ID NO: 325, SEQ ID NO: 520, SEQ ID NO:     533, SEQ ID NO: 546, SEQ ID NO: 559, SEQ ID NO: 572, SEQ ID NO: 585,     SEQ ID NO: 598, SEQ ID NOs 613-636 and 651-658, SEQ ID NOs 660-683     and 698-705, SEQ ID NOs: 707-730 and 745-752, SEQ ID NOs: 754-777     and 792-799, SEQ ID NOs: 801-824 and 839-846, SEQ ID NOs: 848-871     and 886-893, SEQ ID NOs: 895-918 and 933-940, SEQ ID NOs: 942-965     and 980-987, SEQ ID NOs: 989-1012 and 1027-1034, SEQ ID NOs:     1036-1059 and 1074-1081, SEQ ID NOs: 1083-1106 and 1121-1128, SEQ ID     NOs: 1130-1153 and 1168-1175, SEQ ID NOs: 1177-1200 and 1215-1222,     SEQ ID NOs: 1224-1247 and 1262-1269, SEQ ID NOs: 1271-1294 and     1309-1316, SEQ ID NOs: 1318-1341 and 1356-1363, SEQ ID NOs:     1365-1388 and 1403-1410, SEQ ID NOs: 1412-1435 and 1450-1457, SEQ ID     NOs: 1459-1482 and 1497-1504, SEQ ID NOs: 1506-1529 and 1544-1551,     SEQ ID NOs: 1553-1576 and 1591-1598, SEQ ID NOs: 1600-1623 and     1638-1645, SEQ ID NOs: 1647-1670 and 1685-1692, SEQ ID NOs:     1694-1717 and 1732-1739, SEQ ID NOs: 1741-1764 and 1779-1786, SEQ ID     NOs: 1788-1811 and 1826-1833; and -   (b) SEQ ID NO: 13, SEQ ID NO: 338, SEQ ID NO: 351, SEQ ID NO: 364,     SEQ ID NO: 377, SEQ ID NO: 390, SEQ ID NO: 403, SEQ ID NO: 416, SEQ     ID NO: 429, SEQ ID NO: 442, SEQ ID NO: 455, SEQ ID NO: 468, SEQ ID     NO: 481, SEQ ID NO: 494, SEQ ID NO: 507, SEQ ID NO: 611, SEQ ID NOs:     612 and 637-650, SEQ ID NOs: 659 and 684-697, SEQ ID NOs: 706 and     731-744, SEQ ID NOs: 753 and 778-791, SEQ ID NOs: 800 and 825-838,     SEQ ID NOs: 847 and 872-885, SEQ ID NOs: 894 and 919-932, SEQ ID     NOs: 941 and 966-979, SEQ ID NOs: 988 and 1013-1026, SEQ ID NOs:     1035 and 1060-1073, SEQ ID NOs: 1082 and 1107-1120, SEQ ID NOs: 1129     and 1154-1167, SEQ ID NOs: 1176 and 1201-1214, SEQ ID NOs: 1223 and     1248-1261, SEQ ID NOs: 1270 and 1295-1308, SEQ ID NOs: 1317 and     1342-1355, SEQ ID NOs: 1364 and 1389-1402, SEQ ID NOs: 1411 and     1436-1449, SEQ ID NOs: 1458 and 1483-1496, SEQ ID NOs: 1505 and     1530-1543, SEQ ID NOs: 1552 and 1577-1590, SEQ ID NOs: 1599 and     1624-1637, SEQ ID NOs: 1646 and 1671-1684, SEQ ID NOs: 1693 and     1718-1731, SEQ ID NOs: 1740 and 1765-1778, SEQ ID NOs: 1787 and     1812-1825.

Amino acid sequence modifications of the antibody constructs described herein are also contemplated. For example, it may be desirable to improve the binding affinity and/or other biological properties of the antibody construct. Amino acid sequence variants of the antibody constructs are prepared by introducing appropriate nucleotide changes into the antibody constructs nucleic acid, or by peptide synthesis. All of the below described amino acid sequence modifications should result in an antibody construct which still retains the desired biological activity (binding to CDH19 and to CD3) of the unmodified parental molecule.

The term “amino acid” or “amino acid residue” typically refers to an amino acid having its art recognized definition such as an amino acid selected from the group consisting of: alanine (Ala or A); arginine (Arg or R); asparagine (Asn or N); aspartic acid (Asp or D); cysteine (Cys or C); glutamine (GIn or Q); glutamic acid (Glu or E); glycine (Gly or G); histidine (His or H); isoleucine (He or I): leucine (Leu or L); lysine (Lys or K); methionine (Met or M); phenylalanine (Phe or F); pro line (Pro or P); serine (Ser or S); threonine (Thr or T); tryptophan (Trp or W); tyrosine (Tyr or Y); and valine (VaI or V), although modified, synthetic, or rare amino acids may be used as desired. Generally, amino acids can be grouped as having a nonpolar side chain (e.g., Ala, Cys, He, Leu, Met, Phe, Pro, VaI); a negatively charged side chain (e.g., Asp, Glu); a positively charged sidechain (e.g., Arg, His, Lys); or an uncharged polar side chain (e.g., Asn, Cys, GIn, Gly, His, Met, Phe, Ser, Thr, Trp, and Tyr).

Amino acid modifications include, for example, deletions from, and/or insertions into, and/or substitutions of, residues within the amino acid sequences of the antibody constructs. Any combination of deletion, insertion, and substitution is made to arrive at the final construct, provided that the final construct possesses the desired characteristics. The amino acid changes also may alter post-translational processes of the antibody constructs, such as changing the number or position of glycosylation sites.

For example, 1, 2, 3, 4, 5, or 6 amino acids may be inserted or deleted in each of the CDRs (of course, dependent on their length), while 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or 25 amino acids may be inserted or deleted in each of the FRs. Preferably, amino acid sequence insertions include amino- and/or carboxyl-terminal fusions ranging in length from 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 residues to polypeptides containing a hundred or more residues, as well as intra-sequence insertions of single or multiple amino acid residues. An insertional variant of the antibody construct of the invention includes the fusion to the N-terminus or to the C-terminus of the antibody construct to an enzyme or a fusion to a polypeptide which increases the serum half-life of the antibody construct.

The sites of greatest interest for substitutional mutagenesis include the CDRs of the heavy and/or light chain, in particular the hypervariable regions, but FR alterations in the heavy and/or light chain are also contemplated. The substitutions are preferably conservative substitutions as described herein. Preferably, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 amino acids may be substituted in a CDR, while 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or 25 amino acids may be substituted in the framework regions (FRs), depending on the length of the CDR or FR. For example, if a CDR sequence encompasses 6 amino acids, it is envisaged that one, two or three of these amino acids are substituted. Similarly, if a CDR sequence encompasses 15 amino acids it is envisaged that one, two, three, four, five or six of these amino acids are substituted.

A useful method for identification of certain residues or regions of the antibody constructs that are preferred locations for mutagenesis is called “alanine scanning mutagenesis” as described by Cunningham and Wells in Science, 244: 1081-1085 (1989). Here, a residue or group of target residues within the antibody construct is/are identified (e.g. charged residues such as arg, asp, his, lys, and glu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine) to affect the interaction of the amino acids with the epitope.

Those amino acid locations demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at, or for, the sites of substitution. Thus, while the site or region for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se needs not to be predetermined. For example, to analyze or optimize the performance of a mutation at a given site, alanine scanning or random mutagenesis may be conducted at a target codon or region, and the expressed antibody construct variants are screened for the optimal combination of desired activity. Techniques for making substitution mutations at predetermined sites in the DNA having a known sequence are well known, for example, M13 primer mutagenesis and PCR mutagenesis. Screening of the mutants is done using assays of antigen binding activities, such as CDH19 binding.

Generally, if amino acids are substituted in one or more or all of the CDRs of the heavy and/or light chain, it is preferred that the then-obtained “substituted” sequence is at least 60%, more preferably 65%, even more preferably 70%, particularly preferably 75%, more particularly preferably 80% identical to the “original” CDR sequence. This means that it is dependent of the length of the CDR to which degree it is identical to the “substituted” sequence. For example, a CDR having 5 amino acids is preferably 80% identical to its substituted sequence in order to have at least one amino acid substituted. Accordingly, the CDRs of the antibody construct may have different degrees of identity to their substituted sequences, e.g., CDRL1 may have 80%, while CDRL3 may have 90%.

Preferred substitutions (or replacements) are conservative substitutions. However, any substitution (including non-conservative substitution or one or more from the “exemplary substitutions” listed in Table 1, below) is envisaged as long as the antibody construct retains its capability to bind to CDH19 via the first binding domain and to CD3 epsilon via the second binding domain and/or its CDRs have an identity to the then substituted sequence (at least 60%, more preferably 65%, even more preferably 70%, particularly preferably 75%, more particularly preferably 80% identical to the “original” CDR sequence).

Conservative substitutions are shown in Table 1 under the heading of “preferred substitutions”. If such substitutions result in a change in biological activity, then more substantial changes, denominated “exemplary substitutions” in Table A, or as further described below in reference to amino acid classes, may be introduced and the products screened for a desired characteristic.

TABLE A Amino acid substitutions Preferred Original Exemplary Substitutions Substitutions Ala (A) val, leu, ile val Arg (R) lys, gln, asn lys Asn (N) gln, his, asp, lys, arg gln Asp (D) glu, asn glu Cys (C) ser, ala ser Gln (Q) asn, glu asn Glu (E) asp, gln asp Gly (G) Ala ala His (H) asn, gln, lys, arg arg Ile (I) leu, val, met, ala, phe leu Leu (L) norleucine, ile, val, met, ala ile Lys (K) arg, gln, asn arg Met (M) leu, phe, ile leu Phe (F) leu, val, ile, ala, tyr tyr Pro (P) Ala ala Ser (S) Thr thr Thr (T) Ser ser Trp (W) tyr, phe tyr Tyr (Y) trp, phe, thr, ser phe Val (V) ile, leu, met, phe, ala leu

Substantial modifications in the biological properties of the antibody construct of the present invention are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain. Naturally occurring residues are divided into groups based on common side-chain properties: (1) hydrophobic: norleucine, met, ala, val, leu, ile; (2) neutral hydrophilic: cys, ser, thr; (3) acidic: asp, glu; (4) basic: asn, gin, his, lys, arg; (5) residues that influence chain orientation: gly, pro; and (6) aromatic: trp, tyr, phe.

Non-conservative substitutions will entail exchanging a member of one of these classes for another class. Any cysteine residue not involved in maintaining the proper conformation of the antibody construct may be substituted, generally with serine, to improve the oxidative stability of the molecule and prevent aberrant crosslinking. Conversely, cysteine bond(s) may be added to the antibody to improve its stability (particularly where the antibody is an antibody fragment such as an Fv fragment).

For amino acid sequences, sequence identity and/or similarity is determined by using standard techniques known in the art, including, but not limited to, the local sequence identity algorithm of Smith and Waterman, 1981, Adv. Appl. Math. 2:482, the sequence identity alignment algorithm of Needleman and Wunsch, 1970, J. Mol. Biol. 48:443, the search for similarity method of Pearson and Lipman, 1988, Proc. Nat. Acad. Sci. U.S.A. 85:2444, computerized implementations of these algorithms (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group, 575 Science Drive, Madison, Wis.), the Best Fit sequence program described by Devereux et al., 1984, Nucl. Acid Res. 12:387-395, preferably using the default settings, or by inspection. Preferably, percent identity is calculated by FastDB based upon the following parameters: mismatch penalty of 1; gap penalty of 1; gap size penalty of 0.33; and joining penalty of 30, “Current Methods in Sequence Comparison and Analysis,” Macromolecule Sequencing and Synthesis, Selected Methods and Applications, pp 127-149 (1988), Alan R. Liss, Inc.

An example of a useful algorithm is PILEUP. PILEUP creates a multiple sequence alignment from a group of related sequences using progressive, pairwise alignments. It can also plot a tree showing the clustering relationships used to create the alignment. PILEUP uses a simplification of the progressive alignment method of Feng & Doolittle, 1987, J. Mol. Evol. 35:351-360; the method is similar to that described by Higgins and Sharp, 1989, CABIOS 5:151-153. Useful PILEUP parameters including a default gap weight of 3.00, a default gap length weight of 0.10, and weighted end gaps.

Another example of a useful algorithm is the BLAST algorithm, described in: Altschul et al., 1990, J. Mol. Biol. 215:403-410; Altschul et al., 1997, Nucleic Acids Res. 25:3389-3402; and Karin et al., 1993, Proc. Natl. Acad. Sci. U.S.A. 90:5873-5787. A particularly useful BLAST program is the WU-BLAST-2 program which was obtained from Altschul et al., 1996, Methods in Enzymology 266:460-480. WU-BLAST-2 uses several search parameters, most of which are set to the default values. The adjustable parameters are set with the following values: overlap span=1, overlap fraction=0.125, word threshold (T)=II. The HSP S and HSP S2 parameters are dynamic values and are established by the program itself depending upon the composition of the particular sequence and composition of the particular database against which the sequence of interest is being searched; however, the values may be adjusted to increase sensitivity.

An additional useful algorithm is gapped BLAST as reported by Altschul et al., 1993, Nucl. Acids Res. 25:3389-3402. Gapped BLAST uses BLOSUM-62 substitution scores; threshold T parameter set to 9; the two-hit method to trigger ungapped extensions, charges gap lengths of k a cost of 10+k; Xu set to 16, and Xg set to 40 for database search stage and to 67 for the output stage of the algorithms. Gapped alignments are triggered by a score corresponding to about 22 bits.

Generally, the amino acid homology, similarity, or identity between individual variant CDRs are at least 60% to the sequences depicted herein, and more typically with preferably increasing homologies or identities of at least 65% or 70%, more preferably at least 75% or 80%, even more preferably at least 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and almost 100%. In a similar manner, “percent (%) nucleic acid sequence identity” with respect to the nucleic acid sequence of the binding proteins identified herein is defined as the percentage of nucleotide residues in a candidate sequence that are identical with the nucleotide residues in the coding sequence of the antibody construct. A specific method utilizes the BLASTN module of WU-BLAST-2 set to the default parameters, with overlap span and overlap fraction set to 1 and 0.125, respectively.

Generally, the nucleic acid sequence homology, similarity, or identity between the nucleotide sequences encoding individual variant CDRs and the nucleotide sequences depicted herein are at least 60%, and more typically with preferably increasing homologies or identities of at least 65%, 70%, 75%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99%, and almost 100%. Thus, a “variant CDR” is one with the specified homology, similarity, or identity to the parent CDR of the invention, and shares biological function, including, but not limited to, at least 60%, 65%, 70%, 75%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% of the specificity and/or activity of the parent CDR.

In one embodiment, the bispecific antibody constructs of the present invention exhibit high monomer yields under standard research scale conditions, e.g., in a standard two-step purification process. Preferably the monomer yield of the antibody constructs according to the invention is ≧0.25 mg/L supernatant, more preferably ≧0.5 mg/L, even more preferably ≧1 mg/L, and most preferably ≧3 mg/L supernatant.

Likewise, the yield of the dimeric antibody construct isoforms and hence the monomer percentage (i.e., monomer: (monomer+dimer)) of the antibody constructs can be determined. The productivity of monomeric and dimeric antibody constructs and the calculated monomer percentage can e.g. be obtained in the SEC purification step of culture supernatant from standardized research-scale production in roller bottles. In one embodiment, the monomer percentage of the antibody constructs is ≧80%, more preferably ≧85%, even more preferably ≧90%, and most preferably ≧95%.

In a further embodiment, the percentage of identity to human germline of the antibody constructs according to the invention is ≧70% or ≧75%, more preferably ≧80% or ≧85%, even more preferably ≧90%, and most preferably ≧95%. Identity to human antibody germline gene products is thought to be an important feature to reduce the risk of therapeutic proteins to elicit an immune response against the drug in the patient during treatment. Hwang & Foote (“Immunogenicity of engineered antibodies”; Methods 36 (2005) 3-10) demonstrate that the reduction of non-human portions of drug antibody constructs leads to a decrease of risk to induce anti-drug antibodies in the patients during treatment. By comparing an exhaustive number of clinically evaluated antibody drugs and the respective immunogenicity data, the trend is shown that humanization of the V-regions of antibodies makes the protein less immunogenic (average 5.1% of patients) than antibodies carrying unaltered non-human V regions (average 23.59% of patients). A higher degree of identity to human sequences is hence desirable for V-region based protein therapeutics in the form of antibody constructs. For this purpose of determining the germline identity, the V-regions of VL can be aligned with the amino acid sequences of human germline V segments and J segments (http://vbase.mrc-cpe.cam.ac.uk/) using Vector NTI software and the amino acid sequence calculated by dividing the identical amino acid residues by the total number of amino acid residues of the VL in percent. The same can be for the VH segments (http://vbase.mrc-cpe.cam.ac.uk/) with the exception that the VH CDR3 may be excluded due to its high diversity and a lack of existing human germline VH CDR3 alignment partners. Recombinant techniques can then be used to increase sequence identity to human antibody germline genes.

In one embodiment, the antibody constructs have a preferred plasma stability (ratio of EC50 with plasma to EC50 w/o plasma) of ≦5, more preferably ≦4, even more preferably ≦3, and most preferably ≦2. The plasma stability of an antibody construct can be tested by incubation of the construct in human plasma at 37° C. for 24 hours followed by EC50 determination in a 51chromium release cytotoxicity assay. The effector cells in the cytotoxicity assay can be stimulated enriched human CD8 positive T cells. Target cells can e.g. be CHO cells transfected with human CDH19. The effector to target cell (E:T) ratio can be chosen as 10:1. The human plasma pool used for this purpose is derived from the blood of healthy donors collected by EDTA coated syringes. Cellular components are removed by centrifugation and the upper plasma phase is collected and subsequently pooled. As control, antibody constructs are diluted immediately prior to the cytotoxicity assay in RPMI-1640 medium. The plasma stability is calculated as ratio of EC50 (after plasma incubation) to EC50 (control).

It is preferred that the monomer to dimer conversion of antibody constructs of the invention is low. The conversion can be measured under different conditions and analyzed by high performance size exclusion chromatography. For example, incubation of the monomeric isoforms of the antibody constructs can be carried out for 7 days at 37° C. and concentrations of e.g. 100 μg/ml or 250 μg/ml in an incubator. Under these conditions, it is preferred that the antibody constructs of the invention show a dimer percentage that is ≦5%, more preferably ≦4%, even more preferably ≦3%, even more preferably ≦2.5%, even more preferably ≦2%, even more preferably ≦1.5%, and most preferably ≦1%.

It is also preferred that the bispecific antibody constructs of the present invention present with very low dimer conversion after a number of freeze/thaw cycles. For example, the antibody construct monomer is adjusted to a concentration of 250 μg/ml e.g. in SEC running buffer and subjected to three freeze/thaw cycles (freezing at −80° C. for 30 min followed by thawing for 30 min at room temperature), followed by high performance SEC to determine the percentage of initially monomeric antibody construct, which had been converted into dimeric antibody construct. Preferably the dimer percentages of the bispecific antibody constructs are ≦5%, more preferably ≦4%, even more preferably ≦3%, even more preferably ≦2.5%, even more preferably ≦2%, even more preferably ≦1.5%, and most preferably ≦1%, for example after three freeze/thaw cycles.

The bispecific antibody constructs of the present invention preferably show a favorable thermostability with melting temperatures above 60° C. This parameter can be determined as follows: Temperature melting curves are determined by Differential Scanning Calorimetry (DSC) to determine intrinsic biophysical protein stabilities of the antibody constructs. These experiments are performed using a MicroCal LLC (Northampton, Mass., U.S.A) VP-DSC device. The energy uptake of a sample containing an antibody construct is recorded from 20° C. to 90° C. compared to a sample containing only the formulation buffer. The antibody constructs are adjusted to a final concentration of 250 μg/ml e.g. in SEC running buffer. For recording of the respective melting curve, the overall sample temperature is increased stepwise. At each temperature T energy uptake of the sample and the formulation buffer reference is recorded. The difference in energy uptake Cp (kcal/mole/° C.) of the sample minus the reference is plotted against the respective temperature. The melting temperature is defined as the temperature at the first maximum of energy uptake.

In a further embodiment the antibody construct according to the invention is stable at acidic pH. The more tolerant the antibody construct behaves at unphysiologic pH such as pH 5.5 (a pH which is required to run e.g. a cation exchange chromatography), the higher is the recovery of the antibody construct eluted from an ion exchange column relative to the total amount of loaded protein. Recovery of the antibody construct from an ion (e.g., cation) exchange column at pH 5.5 is preferably ≧30%, more preferably ≧40%, more preferably ≧50%, even more preferably ≧60%, even more preferably ≧70%, even more preferably ≧80%, and most preferably ≧90%.

It is furthermore envisaged that the bispecific antibody constructs of the present invention exhibit therapeutic efficacy or anti-tumor activity. This can e.g. be assessed in a study as disclosed in the following example of an advanced stage human tumor xenograft model:

On day 1 of the study, 5×106 cells of a human CDH19 positive cancer cell line are subcutaneously injected in the right dorsal flank of female NOD/SCID mice. When the mean tumor volume reaches about 100 mm3, in vitro expanded human CD3 positive T cells are transplanted into the mice by injection of about 2×107 cells into the peritoneal cavity of the animals. Mice of vehicle control group 1 do not receive effector cells and are used as an untransplanted control for comparison with vehicle control group 2 (receiving effector cells) to monitor the impact of T cells alone on tumor growth. The antibody treatment starts when the mean tumor volume reaches about 200 mm3. The mean tumor size of each treatment group on the day of treatment start should not be statistically different from any other group (analysis of variance). Mice are treated with 0.5 mg/kg/day of a CDH19/CD3 bispecifc antibody construct by intravenous bolus injection for about 15 to 20 days. Tumors are measured by caliper during the study and progress evaluated by intergroup comparison of tumor volumes (TV). The tumor growth inhibition T/C [%] is determined by calculating TV as T/C %=100×(median TV of analyzed group)/(median TV of control group 2).

The skilled person knows how to modify or adapt certain parameters of this study, such as the number of injected tumor cells, the site of injection, the number of transplanted human T cells, the amount of bispecific antibody constructs to be administered, and the timelines, while still arriving at a meaningful and reproducible result. Preferably, the tumor growth inhibition T/C [%] is ≦70 or ≦60, more preferably ≦50 or ≦40, even more preferably ≦30 or ≦20 and most preferably ≦10 or ≦5 or even ≦2.5.

The invention further provides a polynucleotide/nucleic acid molecule encoding an antibody construct of the invention.

A polynucleotide is a biopolymer composed of 13 or more nucleotide monomers covalently bonded in a chain. DNA (such as cDNA) and RNA (such as mRNA) are examples of polynucleotides with distinct biological function. Nucleotides are organic molecules that serve as the monomers or subunits of nucleic acid molecules like DNA or RNA. The nucleic acid molecule or polynucleotide can be double stranded and single stranded, linear and circular. It is preferably comprised in a vector which is preferably comprised in a host cell. Said host cell is, e.g. after transformation or transfection with the vector or the polynucleotide of the invention, capable of expressing the antibody construct. For that purpose the polynucleotide or nucleic acid molecule is operatively linked with control sequences.

The genetic code is the set of rules by which information encoded within genetic material (nucleic acids) is translated into proteins. Biological decoding in living cells is accomplished by the ribosome which links amino acids in an order specified by mRNA, using tRNA molecules to carry amino acids and to read the mRNA three nucleotides at a time. The code defines how sequences of these nucleotide triplets, called codons, specify which amino acid will be added next during protein synthesis. With some exceptions, a three-nucleotide codon in a nucleic acid sequence specifies a single amino acid. Because the vast majority of genes are encoded with exactly the same code, this particular code is often referred to as the canonical or standard genetic code. While the genetic code determines the protein sequence for a given coding region, other genomic regions can influence when and where these proteins are produced.

Furthermore, the invention provides a vector comprising a polynucleotide/nucleic acid molecule of the invention.

A vector is a nucleic acid molecule used as a vehicle to transfer (foreign) genetic material into a cell. The term “vector” encompasses—but is not restricted to—plasmids, viruses, cosmids and artificial chromosomes. In general, engineered vectors comprise an origin of replication, a multicloning site and a selectable marker. The vector itself is generally a nucleotide sequence, commonly a DNA sequence, that comprises an insert (transgene) and a larger sequence that serves as the “backbone” of the vector. Modern vectors may encompass additional features besides the transgene insert and a backbone: promoter, genetic marker, antibiotic resistance, reporter gene, targeting sequence, protein purification tag. Vectors called expression vectors (expression constructs) specifically are for the expression of the transgene in the target cell, and generally have control sequences.

The term “control sequences” refers to DNA sequences necessary for the expression of an operably linked coding sequence in a particular host organism. The control sequences that are suitable for prokaryotes, for example, include a promoter, optionally an operator sequence, and a ribosome binding site. Eukaryotic cells are known to utilize promoters, polyadenylation signals, and enhancers.

A nucleic acid is “operably linked” when it is placed into a functional relationship with another nucleic acid sequence. For example, DNA for a presequence or secretory leader is operably linked to DNA for a polypeptide if it is expressed as a preprotein that participates in the secretion of the polypeptide; a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the sequence; or a ribosome binding site is operably linked to a coding sequence if it is positioned so as to facilitate translation. Generally, “operably linked” means that the DNA sequences being linked are contiguous, and, in the case of a secretory leader, contiguous and in reading phase. However, enhancers do not have to be contiguous. Linking is accomplished by ligation at convenient restriction sites. If such sites do not exist, the synthetic oligonucleotide adaptors or linkers are used in accordance with conventional practice.

“Transfection” is the process of deliberately introducing nucleic acid molecules or polynucleotides (including vectors) into target cells. The term is mostly used for non-viral methods in eukaryotic cells. Transduction is often used to describe virus-mediated transfer of nucleic acid molecules or polynucleotides. Transfection of animal cells typically involves opening transient pores or “holes” in the cell membrane, to allow the uptake of material. Transfection can be carried out using calcium phosphate, by electroporation, by cell squeezing or by mixing a cationic lipid with the material to produce liposomes, which fuse with the cell membrane and deposit their cargo inside.

The term “transformation” is used to describe non-viral transfer of nucleic acid molecules or polynucleotides (including vectors) into bacteria, and also into non-animal eukaryotic cells, including plant cells. Transformation is hence the genetic alteration of a bacterial or non-animal eukaryotic cell resulting from the direct uptake through the cell membrane(s) from its surroundings and subsequent incorporation of exogenous genetic material (nucleic acid molecules). Transformation can be effected by artificial means. For transformation to happen, cells or bacteria must be in a state of competence, which might occur as a time-limited response to environmental conditions such as starvation and cell density.

Moreover, the invention provides a host cell transformed or transfected with the polynucleotide/nucleic acid molecule or with the vector of the invention.

As used herein, the terms “host cell” or “recipient cell” are intended to include any individual cell or cell culture that can be or has/have been recipients of vectors, exogenous nucleic acid molecules, and polynucleotides encoding the antibody construct of the present invention; and/or recipients of the antibody construct itself. The introduction of the respective material into the cell is carried out by way of transformation, transfection and the like. The term “host cell” is also intended to include progeny or potential progeny of a single cell. Because certain modifications may occur in succeeding generations due to either natural, accidental, or deliberate mutation or due to environmental influences, such progeny may not, in fact, be completely identical (in morphology or in genomic or total DNA complement) to the parent cell, but is still included within the scope of the term as used herein. Suitable host cells include prokaryotic or eukaryotic cells, and also include but are not limited to bacteria, yeast cells, fungi cells, plant cells, and animal cells such as insect cells and mammalian cells, e.g., murine, rat, macaque or human.

The antibody construct of the invention can be produced in bacteria. After expression, the antibody construct of the invention is isolated from the E. coli cell paste in a soluble fraction and can be purified through, e.g., affinity chromatography and/or size exclusion. Final purification can be carried out similar to the process for purifying antibody expressed e.g., in CHO cells.

In addition to prokaryotes, eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for the antibody construct of the invention. Saccharomyces cerevisiae, or common baker's yeast, is the most commonly used among lower eukaryotic host microorganisms. However, a number of other genera, species, and strains are commonly available and useful herein, such as Schizosaccharomyces pombe, Kluyveromyces hosts such as K. lactis, K. fragilis (ATCC 12424), K. bulgaricus (ATCC 16045), K. wickeramii (ATCC 24178), K. waltii (ATCC 56500), K. drosophilarum (ATCC 36906), K. thermotolerans, and K. marxianus; yarrowia (EP 402 226); Pichia pastoris (EP 183 070); Candida; Trichoderma reesia (EP 244 234); Neurospora crassa; Schwanniomyces such as Schwanniomyces occidentalis; and filamentous fungi such as Neurospora, Penicillium, Tolypocladium, and Aspergillus hosts such as A. nidulans and A. niger.

Suitable host cells for the expression of glycosylated antibody construct of the invention are derived from multicellular organisms. Examples of invertebrate cells include plant and insect cells. Numerous baculoviral strains and variants and corresponding permissive insect host cells from hosts such as Spodoptera frugiperda (caterpillar), Aedes aegypti (mosquito), Aedes albopictus (mosquito), Drosophila melanogaster (fruit fly), and Bombyx mori have been identified. A variety of viral strains for transfection are publicly available, e.g., the L-1 variant of Autographa californica NPV and the Bm-5 strain of Bombyx mori NPV, and such viruses may be used as the virus herein according to the present invention, particularly for transfection of Spodoptera frugiperda cells.

Plant cell cultures of cotton, corn, potato, soybean, petunia, tomato, Arabidopsis and tobacco can also be used as hosts. Cloning and expression vectors useful in the production of proteins in plant cell culture are known to those of skill in the art. See e.g. Hiatt et al., Nature (1989) 342: 76-78, Owen et al. (1992) Bio/Technology 10: 790-794, Artsaenko et al. (1995) The Plant J 8: 745-750, and Fecker et al. (1996) Plant Mol Biol 32: 979-986.

However, interest has been greatest in vertebrate cells, and propagation of vertebrate cells in culture (tissue culture) has become a routine procedure. Examples of useful mammalian host cell lines are monkey kidney CV1 line transformed by SV40 (COS-7, ATCC CRL 1651); human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture, Graham et al., J. Gen Virol. 36: 59 (1977)); baby hamster kidney cells (BHK, ATCC CCL 10); Chinese hamster ovary cells/-DHFR (CHO, Urlaub et al., Proc. Natl. Acad. Sci. USA 77: 4216 (1980)); mouse sertoli cells (TM4, Mather, Biol. Reprod. 23: 243-251 (1980)); monkey kidney cells (CVI ATCC CCL 70); African green monkey kidney cells (VERO-76, ATCC CRL1587); human cervical carcinoma cells (HELA, ATCC CCL 2); canine kidney cells (MDCK, ATCC CCL 34); buffalo rat liver cells (BRL 3A, ATCC CRL 1442); human lung cells (W138, ATCC CCL 75); human liver cells (Hep G2,1413 8065); mouse mammary tumor (MMT 060562, ATCC CCLS 1); TRI cells (Mather et al., Annals N. Y Acad. Sci. (1982) 383: 44-68); MRC 5 cells; FS4 cells; and a human hepatoma line (Hep G2).

In a further embodiment the invention provides a process for the production of an antibody construct of the invention, said process comprising culturing a host cell of the invention under conditions allowing the expression of the antibody construct of the invention and recovering the produced antibody construct from the culture.

As used herein, the term “culturing” refers to the in vitro maintenance, differentiation, growth, proliferation and/or propagation of cells under suitable conditions in a medium. The term “expression” includes any step involved in the production of an antibody construct of the invention including, but not limited to, transcription, post-transcriptional modification, translation, post-translational modification, and secretion.

When using recombinant techniques, the antibody construct can be produced intracellularly, in the periplasmic space, or directly secreted into the medium. If the antibody construct is produced intracellularly, as a first step, the particulate debris, either host cells or lysed fragments, are removed, for example, by centrifugation or ultrafiltration. Carter et al., Bio/Technology 10: 163-167 (1992) describe a procedure for isolating antibodies which are secreted to the periplasmic space of E. coli. Briefly, cell paste is thawed in the presence of sodium acetate (pH 3.5), EDTA, and phenylmethylsulfonylfluoride (PMSF) over about 30 min. Cell debris can be removed by centrifugation. Where the antibody is secreted into the medium, supernatants from such expression systems are generally first concentrated using a commercially available protein concentration filter, for example, an Amicon or Millipore Pellicon ultrafiltration unit. A protease inhibitor such as PMSF may be included in any of the foregoing steps to inhibit proteolysis and antibiotics may be included to prevent the growth of adventitious contaminants.

The antibody construct of the invention prepared from the host cells can be recovered or purified using, for example, hydroxylapatite chromatography, gel electrophoresis, dialysis, and affinity chromatography. Other techniques for protein purification such as fractionation on an ion-exchange column, ethanol precipitation, Reverse Phase HPLC, chromatography on silica, chromatography on heparin SEPHAROSE™, chromatography on an anion or cation exchange resin (such as a polyaspartic acid column), chromato-focusing, SDS-PAGE, and ammonium sulfate precipitation are also available depending on the antibody to be recovered. Where the antibody construct of the invention comprises a CH3 domain, the Bakerbond ABX resin (J. T. Baker, Phillipsburg, N.J.) is useful for purification.

Affinity chromatography is a preferred purification technique. The matrix to which the affinity ligand is attached is most often agarose, but other matrices are available. Mechanically stable matrices such as controlled pore glass or poly(styrenedivinyl)benzene allow for faster flow rates and shorter processing times than can be achieved with agarose.

Moreover, the invention provides a pharmaceutical composition comprising an antibody construct of the invention or an antibody construct produced according to the process of the invention.

As used herein, the term “pharmaceutical composition” relates to a composition which is suitable for administration to a patient, preferably a human patient. The particularly preferred pharmaceutical composition of this invention comprises one or a plurality of the antibody construct(s) of the invention, preferably in a therapeutically effective amount. Preferably, the pharmaceutical composition further comprises suitable formulations of one or more (pharmaceutically effective) carriers, stabilizers, excipients, diluents, solubilizers, surfactants, emulsifiers, preservatives and/or adjuvants. Acceptable constituents of the composition are preferably nontoxic to recipients at the dosages and concentrations employed. Pharmaceutical compositions of the invention include, but are not limited to, liquid, frozen, and lyophilized compositions.

The inventive compositions may comprise a pharmaceutically acceptable carrier. In general, as used herein, “pharmaceutically acceptable carrier” means any and all aqueous and non-aqueous solutions, sterile solutions, solvents, buffers, e.g. phosphate buffered saline (PBS) solutions, water, suspensions, emulsions, such as oil/water emulsions, various types of wetting agents, liposomes, dispersion media and coatings, which are compatible with pharmaceutical administration, in particular with parenteral administration. The use of such media and agents in pharmaceutical compositions is well known in the art, and the compositions comprising such carriers can be formulated by well-known conventional methods.

Certain embodiments provide pharmaceutical compositions comprising the antibody construct of the invention and further one or more excipients such as those illustratively described in this section and elsewhere herein. Excipients can be used in the invention in this regard for a wide variety of purposes, such as adjusting physical, chemical, or biological properties of formulations, such as adjustment of viscosity, and or processes of the invention to improve effectiveness and or to stabilize such formulations and processes against degradation and spoilage due to, for instance, stresses that occur during manufacturing, shipping, storage, pre-use preparation, administration, and thereafter.

In certain embodiments, the pharmaceutical composition may contain formulation materials for the purpose of modifying, maintaining or preserving, e.g., the pH, osmolarity, viscosity, clarity, color, isotonicity, odor, sterility, stability, rate of dissolution or release, adsorption or penetration of the composition (see, REMINGTON'S PHARMACEUTICAL SCIENCES, 18″ Edition, (A. R. Genrmo, ed.), 1990, Mack Publishing Company). In such embodiments, suitable formulation materials may include, but are not limited to:

-   -   amino acids such as glycine, alanine, glutamine, asparagine,         threonine, proline, 2-phenylalanine, including charged amino         acids, preferably lysine, lysine acetate, arginine, glutamate         and/or histidine     -   antimicrobials such as antibacterial and antifungal agents     -   antioxidants such as ascorbic acid, methionine, sodium sulfite         or sodium hydrogen-sulfite;     -   buffers, buffer systems and buffering agents which are used to         maintain the composition at physiological pH or at a slightly         lower pH, typically within a pH range of from about 5 to about 8         or 9; examples of buffers are borate, bicarbonate, Tris-HCl,         citrates, phosphates or other organic acids, succinate,         phosphate, histidine and acetate; for example Tris buffer of         about pH 7.0-8.5, or acetate buffer of about pH 4.0-5.5;     -   non-aqueous solvents such as propylene glycol, polyethylene         glycol, vegetable oils such as olive oil, and injectable organic         esters such as ethyl oleate;     -   aqueous carriers including water, alcoholic/aqueous solutions,         emulsions or suspensions, including saline and buffered media;     -   biodegradable polymers such as polyesters;     -   bulking agents such as mannitol or glycine;     -   chelating agents such as ethylenediamine tetraacetic acid         (EDTA);     -   isotonic and absorption delaying agents;     -   complexing agents such as caffeine, polyvinylpyrrolidone,         beta-cyclodextrin or hydroxypropyl-beta-cyclodextrin)     -   fillers;     -   monosaccharides; disaccharides; and other carbohydrates (such as         glucose, mannose or dextrins); carbohydrates may be non-reducing         sugars, preferably trehalose, sucrose, octasulfate, sorbitol or         xylitol;     -   (low molecular weight) proteins, polypeptides or proteinaceous         carriers such as human or bovine serum albumin, gelatin or         immunoglobulins, preferably of human origin;     -   coloring and flavouring agents;     -   sulfur containing reducing agents, such as glutathione, thioctic         acid, sodium thioglycolate, thioglycerol,         [alpha]-monothioglycerol, and sodium thio sulfate     -   diluting agents;     -   emulsifying agents;     -   hydrophilic polymers such as polyvinylpyrrolidone)     -   salt-forming counter-ions such as sodium;     -   preservatives such as antimicrobials, anti-oxidants, chelating         agents, inert gases and the like; examples are: benzalkonium         chloride, benzoic acid, salicylic acid, thimerosal, phenethyl         alcohol, methylparaben, propylparaben, chlorhexidine, sorbic         acid or hydrogen peroxide);     -   metal complexes such as Zn-protein complexes;     -   solvents and co-solvents (such as glycerin, propylene glycol or         polyethylene glycol);     -   sugars and sugar alcohols, such as trehalose, sucrose,         octasulfate, mannitol, sorbitol or xylitol stachyose, mannose,         sorbose, xylose, ribose, myoinisitose, galactose, lactitol,         ribitol, myoinisitol, galactitol, glycerol, cyclitols (e.g.,         inositol), polyethylene glycol; and polyhydric sugar alcohols;     -   suspending agents;     -   surfactants or wetting agents such as pluronics, PEG, sorbitan         esters, polysorbates such as polysorbate 20, polysorbate,         triton, tromethamine, lecithin, cholesterol, tyloxapal;         surfactants may be detergents, preferably with a molecular         weight of >1.2 KD and/or a polyether, preferably with a         molecular weight of >3 KD; non-limiting examples for preferred         detergents are Tween 20, Tween 40, Tween 60, Tween 80 and Tween         85; non-limiting examples for preferred polyethers are PEG 3000,         PEG 3350, PEG 4000 and PEG 5000;     -   stability enhancing agents such as sucrose or sorbitol;     -   tonicity enhancing agents such as alkali metal halides,         preferably sodium or potassium chloride, mannitol sorbitol;     -   parenteral delivery vehicles including sodium chloride solution,         Ringer's dextrose, dextrose and sodium chloride, lactated         Ringer's, or fixed oils;     -   intravenous delivery vehicles including fluid and nutrient         replenishers, electrolyte replenishers (such as those based on         Ringer's dextrose).

It is evident to those skilled in the art that the different constituents of the pharmaceutical composition (e.g., those listed above) can have different effects, for example, and amino acid can act as a buffer, a stabilizer and/or an antioxidant; mannitol can act as a bulking agent and/or a tonicity enhancing agent; sodium chloride can act as delivery vehicle and/or tonicity enhancing agent; etc.

It is envisaged that the composition of the invention might comprise, in addition to the polypeptide of the invention defined herein, further biologically active agents, depending on the intended use of the composition. Such agents might be drugs acting on the gastrointestinal system, drugs acting as cytostatica, drugs preventing hyperurikemia, drugs inhibiting immunoreactions (e.g. corticosteroids), drugs modulating the inflammatory response, drugs acting on the circulatory system and/or agents such as cytokines known in the art. It is also envisaged that the antibody construct of the present invention is applied in a co-therapy, i.e., in combination with another anti-cancer medicament.

In certain embodiments, the optimal pharmaceutical composition will be determined by one skilled in the art depending upon, for example, the intended route of administration, delivery format and desired dosage. See, for example, REMINGTON'S PHARMACEUTICAL SCIENCES, supra. In certain embodiments, such compositions may influence the physical state, stability, rate of in vivo release and rate of in vivo clearance of the antibody construct of the invention. In certain embodiments, the primary vehicle or carrier in a pharmaceutical composition may be either aqueous or non-aqueous in nature. For example, a suitable vehicle or carrier may be water for injection, physiological saline solution or artificial cerebrospinal fluid, possibly supplemented with other materials common in compositions for parenteral administration. Neutral buffered saline or saline mixed with serum albumin are further exemplary vehicles. In certain embodiments, the antibody construct of the invention compositions may be prepared for storage by mixing the selected composition having the desired degree of purity with optional formulation agents (REMINGTON'S PHARMACEUTICAL SCIENCES, supra) in the form of a lyophilized cake or an aqueous solution. Further, in certain embodiments, the antibody construct of the invention may be formulated as a lyophilizate using appropriate excipients such as sucrose.

When parenteral administration is contemplated, the therapeutic compositions for use in this invention may be provided in the form of a pyrogen-free, parenterally acceptable aqueous solution comprising the desired antibody construct of the invention in a pharmaceutically acceptable vehicle. A particularly suitable vehicle for parenteral injection is sterile distilled water in which the antibody construct of the invention is formulated as a sterile, isotonic solution, properly preserved. In certain embodiments, the preparation can involve the formulation of the desired molecule with an agent, such as injectable microspheres, bio-erodible particles, polymeric compounds (such as polylactic acid or polyglycolic acid), beads or liposomes, that may provide controlled or sustained release of the product which can be delivered via depot injection. In certain embodiments, hyaluronic acid may also be used, having the effect of promoting sustained duration in the circulation. In certain embodiments, implantable drug delivery devices may be used to introduce the desired antibody construct.

Additional pharmaceutical compositions will be evident to those skilled in the art, including formulations involving the antibody construct of the invention in sustained- or controlled-delivery/release formulations. Techniques for formulating a variety of other sustained- or controlled-delivery means, such as liposome carriers, bio-erodible microparticles or porous beads and depot injections, are also known to those skilled in the art. See, for example, International Patent Application No. PCT/US93/00829, which describes controlled release of porous polymeric microparticles for delivery of pharmaceutical compositions. Sustained-release preparations may include semipermeable polymer matrices in the form of shaped articles, e.g., films, or microcapsules. Sustained release matrices may include polyesters, hydrogels, polylactides (as disclosed in U.S. Pat. No. 3,773,919 and European Patent Application Publication No. EP 058481), copolymers of L-glutamic acid and gamma ethyl-L-glutamate (Sidman et al., 1983, Biopolymers 2:547-556), poly(2-hydroxyethyl-methacrylate) (Langer et al., 1981, J. Biomed. Mater. Res. 15:167-277 and Langer, 1982, Chem. Tech. 12:98-105), ethylene vinyl acetate (Langer et al., 1981, supra) or poly-D(−)-3-hydroxybutyric acid (European Patent Application Publication No. EP 133,988). Sustained release compositions may also include liposomes that can be prepared by any of several methods known in the art. See, e.g., Eppstein et al., 1985, Proc. Natl. Acad. Sci. U.S.A. 82:3688-3692; European Patent Application Publication Nos. EP 036,676; EP 088,046 and EP 143,949.

The antibody construct may also be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymerization (for example, hydroxymethylcellulose or gelatine-microcapsules and poly(methylmethacylate) microcapsules, respectively), in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nanoparticles and nanocapsules), or in macroemulsions. Such techniques are disclosed in Remington's Pharmaceutical Sciences, 16th edition, Oslo, A., Ed., (1980).

Pharmaceutical compositions used for in vivo administration are typically provided as sterile preparations. Sterilization can be accomplished by filtration through sterile filtration membranes. When the composition is lyophilized, sterilization using this method may be conducted either prior to or following lyophilization and reconstitution. Compositions for parenteral administration can be stored in lyophilized form or in a solution. Parenteral compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having a stopper pierceable by a hypodermic injection needle.

Another aspect of the invention includes self-buffering antibody construct of the invention formulations, which can be used as pharmaceutical compositions, as described in international patent application WO 06138181A2 (PCT/US2006/022599). A variety of expositions are available on protein stabilization and formulation materials and methods useful in this regard, such as Arakawa et al., “Solvent interactions in pharmaceutical formulations,” Pharm Res. 8(3): 285-91 (1991); Kendrick et al., “Physical stabilization of proteins in aqueous solution,” in: RATIONAL DESIGN OF STABLE PROTEIN FORMULATIONS: THEORY AND PRACTICE, Carpenter and Manning, eds. Pharmaceutical Biotechnology. 13: 61-84 (2002), and Randolph et al., “Surfactant-protein interactions,” Pharm Biotechnol. 13: 159-75 (2002), see particularly the parts pertinent to excipients and processes of the same for self-buffering protein formulations in accordance with the current invention, especially as to protein pharmaceutical products and processes for veterinary and/or human medical uses.

Salts may be used in accordance with certain embodiments of the invention to, for example, adjust the ionic strength and/or the isotonicity of a formulation and/or to improve the solubility and/or physical stability of a protein or other ingredient of a composition in accordance with the invention. As is well known, ions can stabilize the native state of proteins by binding to charged residues on the protein's surface and by shielding charged and polar groups in the protein and reducing the strength of their electrostatic interactions, attractive, and repulsive interactions. Ions also can stabilize the denatured state of a protein by binding to, in particular, the denatured peptide linkages (—CONH) of the protein. Furthermore, ionic interaction with charged and polar groups in a protein also can reduce intermolecular electrostatic interactions and, thereby, prevent or reduce protein aggregation and insolubility.

Ionic species differ significantly in their effects on proteins. A number of categorical rankings of ions and their effects on proteins have been developed that can be used in formulating pharmaceutical compositions in accordance with the invention. One example is the Hofmeister series, which ranks ionic and polar non-ionic solutes by their effect on the conformational stability of proteins in solution. Stabilizing solutes are referred to as “kosmotropic.” Destabilizing solutes are referred to as “chaotropic.” Kosmotropes commonly are used at high concentrations (e.g., >1 molar ammonium sulfate) to precipitate proteins from solution (“salting-out”). Chaotropes commonly are used to denture and/or to solubilize proteins (“salting-in”). The relative effectiveness of ions to “salt-in” and “salt-out” defines their position in the Hofmeister series.

Free amino acids can be used in the antibody construct of the invention formulations in accordance with various embodiments of the invention as bulking agents, stabilizers, and antioxidants, as well as other standard uses. Lysine, proline, serine, and alanine can be used for stabilizing proteins in a formulation. Glycine is useful in lyophilization to ensure correct cake structure and properties. Arginine may be useful to inhibit protein aggregation, in both liquid and lyophilized formulations. Methionine is useful as an antioxidant.

Polyols include sugars, e.g., mannitol, sucrose, and sorbitol and polyhydric alcohols such as, for instance, glycerol and propylene glycol, and, for purposes of discussion herein, polyethylene glycol (PEG) and related substances. Polyols are kosmotropic. They are useful stabilizing agents in both liquid and lyophilized formulations to protect proteins from physical and chemical degradation processes. Polyols also are useful for adjusting the tonicity of formulations. Among polyols useful in select embodiments of the invention is mannitol, commonly used to ensure structural stability of the cake in lyophilized formulations. It ensures structural stability to the cake. It is generally used with a lyoprotectant, e.g., sucrose. Sorbitol and sucrose are among preferred agents for adjusting tonicity and as stabilizers to protect against freeze-thaw stresses during transport or the preparation of bulks during the manufacturing process. Reducing sugars (which contain free aldehyde or ketone groups), such as glucose and lactose, can glycate surface lysine and arginine residues. Therefore, they generally are not among preferred polyols for use in accordance with the invention. In addition, sugars that form such reactive species, such as sucrose, which is hydrolyzed to fructose and glucose under acidic conditions, and consequently engenders glycation, also is not among preferred polyols of the invention in this regard. PEG is useful to stabilize proteins and as a cryoprotectant and can be used in the invention in this regard.

Embodiments of the antibody construct of the invention formulations further comprise surfactants. Protein molecules may be susceptible to adsorption on surfaces and to denaturation and consequent aggregation at air-liquid, solid-liquid, and liquid-liquid interfaces. These effects generally scale inversely with protein concentration. These deleterious interactions generally scale inversely with protein concentration and typically are exacerbated by physical agitation, such as that generated during the shipping and handling of a product. Surfactants routinely are used to prevent, minimize, or reduce surface adsorption. Useful surfactants in the invention in this regard include polysorbate 20, polysorbate 80, other fatty acid esters of sorbitan polyethoxylates, and poloxamer 188. Surfactants also are commonly used to control protein conformational stability. The use of surfactants in this regard is protein-specific since, any given surfactant typically will stabilize some proteins and destabilize others.

Polysorbates are susceptible to oxidative degradation and often, as supplied, contain sufficient quantities of peroxides to cause oxidation of protein residue side-chains, especially methionine. Consequently, polysorbates should be used carefully, and when used, should be employed at their lowest effective concentration. In this regard, polysorbates exemplify the general rule that excipients should be used in their lowest effective concentrations.

Embodiments of the antibody construct of the invention formulations further comprise one or more antioxidants. To some extent deleterious oxidation of proteins can be prevented in pharmaceutical formulations by maintaining proper levels of ambient oxygen and temperature and by avoiding exposure to light. Antioxidant excipients can be used as well to prevent oxidative degradation of proteins. Among useful antioxidants in this regard are reducing agents, oxygen/free-radical scavengers, and chelating agents. Antioxidants for use in therapeutic protein formulations in accordance with the invention preferably are water-soluble and maintain their activity throughout the shelf life of a product. EDTA is a preferred antioxidant in accordance with the invention in this regard. Antioxidants can damage proteins. For instance, reducing agents, such as glutathione in particular, can disrupt intramolecular disulfide linkages. Thus, antioxidants for use in the invention are selected to, among other things, eliminate or sufficiently reduce the possibility of themselves damaging proteins in the formulation.

Formulations in accordance with the invention may include metal ions that are protein co-factors and that are necessary to form protein coordination complexes, such as zinc necessary to form certain insulin suspensions. Metal ions also can inhibit some processes that degrade proteins. However, metal ions also catalyze physical and chemical processes that degrade proteins. Magnesium ions (10-120 mM) can be used to inhibit isomerization of aspartic acid to isoaspartic acid. Ca+2 ions (up to 100 mM) can increase the stability of human deoxyribonuclease. Mg+2, Mn+2, and Zn+2, however, can destabilize rhDNase. Similarly, Ca+2 and Sr+2 can stabilize Factor VIII, it can be destabilized by Mg+2, Mn+2 and Zn+2, Cu+2 and Fe+2, and its aggregation can be increased by Al+3 ions.

Embodiments of the antibody construct of the invention formulations further comprise one or more preservatives. Preservatives are necessary when developing multi-dose parenteral formulations that involve more than one extraction from the same container. Their primary function is to inhibit microbial growth and ensure product sterility throughout the shelf-life or term of use of the drug product. Commonly used preservatives include benzyl alcohol, phenol and m-cresol. Although preservatives have a long history of use with small-molecule parenterals, the development of protein formulations that includes preservatives can be challenging. Preservatives almost always have a destabilizing effect (aggregation) on proteins, and this has become a major factor in limiting their use in multi-dose protein formulations. To date, most protein drugs have been formulated for single-use only. However, when multi-dose formulations are possible, they have the added advantage of enabling patient convenience, and increased marketability. A good example is that of human growth hormone (hGH) where the development of preserved formulations has led to commercialization of more convenient, multi-use injection pen presentations. At least four such pen devices containing preserved formulations of hGH are currently available on the market. Norditropin (liquid, Novo Nordisk), Nutropin AQ (liquid, Genentech) & Genotropin (lyophilized—dual chamber cartridge, Pharmacia & Upjohn) contain phenol while Somatrope (Eli Lilly) is formulated with m-cresol. Several aspects need to be considered during the formulation and development of preserved dosage forms. The effective preservative concentration in the drug product must be optimized. This requires testing a given preservative in the dosage form with concentration ranges that confer anti-microbial effectiveness without compromising protein stability.

As might be expected, development of liquid formulations containing preservatives are more challenging than lyophilized formulations. Freeze-dried products can be lyophilized without the preservative and reconstituted with a preservative containing diluent at the time of use. This shortens the time for which a preservative is in contact with the protein, significantly minimizing the associated stability risks. With liquid formulations, preservative effectiveness and stability should be maintained over the entire product shelf-life (about 18 to 24 months). An important point to note is that preservative effectiveness should be demonstrated in the final formulation containing the active drug and all excipient components.

The antibody constructs disclosed herein may also be formulated as immuno-liposomes. A “liposome” is a small vesicle composed of various types of lipids, phospholipids and/or surfactant which is useful for delivery of a drug to a mammal. The components of the liposome are commonly arranged in a bilayer formation, similar to the lipid arrangement of biological membranes. Liposomes containing the antibody construct are prepared by methods known in the art, such as described in Epstein et al., Proc. Natl. Acad. Sci. USA, 82: 3688 (1985); Hwang et al., Proc. Natl Acad. Sci. USA, 77: 4030 (1980); U.S. Pat. Nos. 4,485,045 and 4,544,545; and WO 97/38731. Liposomes with enhanced circulation time are disclosed in U.S. Pat. No. 5,013,556. Particularly useful liposomes can be generated by the reverse phase evaporation method with a lipid composition comprising phosphatidylcholine, cholesterol and PEG-derivatized phosphatidylethanolamine (PEG-PE). Liposomes are extruded through filters of defined pore size to yield liposomes with the desired diameter. Fab′ fragments of the antibody construct of the present invention can be conjugated to the liposomes as described in Martin et al. J. Biol. Chem. 257: 286-288 (1982) via a disulfide interchange reaction. A chemotherapeutic agent is optionally contained within the liposome. See Gabizon et al. J. National Cancer Inst. 81 (19) 1484 (1989).

Once the pharmaceutical composition has been formulated, it may be stored in sterile vials as a solution, suspension, gel, emulsion, solid, crystal, or as a dehydrated or lyophilized powder. Such formulations may be stored either in a ready-to-use form or in a form (e.g., lyophilized) that is reconstituted prior to administration.

The biological activity of the pharmaceutical composition defined herein can be determined for instance by cytotoxicity assays, as described in the following examples, in WO 99/54440 or by Schlereth et al. (Cancer Immunol. Immunother. 20 (2005), 1-12). “Efficacy” or “in vivo efficacy” as used herein refers to the response to therapy by the pharmaceutical composition of the invention, using e.g. standardized NCI response criteria. The success or in vivo efficacy of the therapy using a pharmaceutical composition of the invention refers to the effectiveness of the composition for its intended purpose, i.e. the ability of the composition to cause its desired effect, i.e. depletion of pathologic cells, e.g. tumor cells. The in vivo efficacy may be monitored by established standard methods for the respective disease entities including, but not limited to white blood cell counts, differentials, Fluorescence Activated Cell Sorting, bone marrow aspiration. In addition, various disease specific clinical chemistry parameters and other established standard methods may be used. Furthermore, computer-aided tomography, X-ray, nuclear magnetic resonance tomography (e.g. for National Cancer Institute-criteria based response assessment [Cheson B D, Horning S J, Coiffier B, Shipp M A, Fisher R I, Connors J M, Lister T A, Vose J, Grillo-Lopez A, Hagenbeek A, Cabanillas F, Klippensten D, Hiddemann W, Castellino R, Harris N L, Armitage J O, Carter W, Hoppe R, Canellos G P. Report of an international workshop to standardize response criteria for non-Hodgkin's lymphomas. NCI Sponsored International Working Group. J Clin Oncol. 1999 April; 17(4): 1244]), positron-emission tomography scanning, white blood cell counts, differentials, Fluorescence Activated Cell Sorting, bone marrow aspiration, lymph node biopsies/histologies, and various lymphoma specific clinical chemistry parameters (e.g. lactate dehydrogenase) and other established standard methods may be used.

Another major challenge in the development of drugs such as the pharmaceutical composition of the invention is the predictable modulation of pharmacokinetic properties. To this end, a pharmacokinetic profile of the drug candidate, i.e. a profile of the pharmacokinetic parameters that affect the ability of a particular drug to treat a given condition, can be established. Pharmacokinetic parameters of the drug influencing the ability of a drug for treating a certain disease entity include, but are not limited to: half-life, volume of distribution, hepatic first-pass metabolism and the degree of blood serum binding. The efficacy of a given drug agent can be influenced by each of the parameters mentioned above.

“Half-life” means the time where 50% of an administered drug are eliminated through biological processes, e.g. metabolism, excretion, etc. By “hepatic first-pass metabolism” is meant the propensity of a drug to be metabolized upon first contact with the liver, i.e. during its first pass through the liver. “Volume of distribution” means the degree of retention of a drug throughout the various compartments of the body, like e.g. intracellular and extracellular spaces, tissues and organs, etc. and the distribution of the drug within these compartments. “Degree of blood serum binding” means the propensity of a drug to interact with and bind to blood serum proteins, such as albumin, leading to a reduction or loss of biological activity of the drug.

Pharmacokinetic parameters also include bioavailability, lag time (Tlag), Tmax, absorption rates, more onset and/or Cmax for a given amount of drug administered. “Bioavailability” means the amount of a drug in the blood compartment. “Lag time” means the time delay between the administration of the drug and its detection and measurability in blood or plasma. “Tmax” is the time after which maximal blood concentration of the drug is reached, and “Cmax” is the blood concentration maximally obtained with a given drug. The time to reach a blood or tissue concentration of the drug which is required for its biological effect is influenced by all parameters. Pharmacokinetic parameters of bispecific antibody constructs exhibiting cross-species specificity, which may be determined in preclinical animal testing in non-chimpanzee primates as outlined above, are also set forth e.g. in the publication by Schlereth et al. (Cancer Immunol. Immunother. 20 (2005), 1-12).

In one embodiment the invention provides the antibody construct of the invention or the antibody construct produced according to the process of the invention for use in the prevention, treatment or amelioration of a melanoma disease or a metastatic melanoma disease.

The formulations described herein are useful as pharmaceutical compositions in the treatment, amelioration and/or prevention of the pathological medical condition as described herein in a patient in need thereof. The term “treatment” refers to both therapeutic treatment and prophylactic or preventative measures. Treatment includes the application or administration of the formulation to the body, an isolated tissue, or cell from a patient who has a disease/disorder, a symptom of a disease/disorder, or a predisposition toward a disease/disorder, with the purpose to cure, heal, alleviate, relieve, alter, remedy, ameliorate, improve, or affect the disease, the symptom of the disease, or the predisposition toward the disease.

The term “amelioration” as used herein refers to any improvement of the disease state of a patient having melanoma/metastatic melanoma as specified herein, by the administration of an antibody construct according to the invention to a subject in need thereof. Such an improvement may also be seen as a slowing or stopping of the progression of the (metastatic) melanoma disease of the patient. The term “prevention” as used herein means the avoidance of the occurrence or re-occurrence of a patient having melanoma/metastatic melanoma as specified herein, by the administration of an antibody construct according to the invention to a subject in need thereof.

The term “disease” refers to any condition that would benefit from treatment with the antibody construct or the pharmaceutic composition described herein. This includes chronic and acute disorders or diseases including those pathological conditions that predispose the mammal to the disease in question. A “melanoma disease” is a type of skin cancer which forms from melanocytes. In metastatic melanoma, brain metastases are particularly common, but the term “metatstatic melanoma disease” also encompasses metastases to the liver, bones, skin, heart, lung, abdomen, (distant) lymph nodes.

In a preferred embodiment of the invention, the melanoma disease or metastatic melanoma disease is selected from the group consisting of superficial spreading melanoma (SSM), lentigo maligna (also known as “lentiginous melanoma on sun-damaged skin”), lentigo maligna melanoma, acral lentiginous melanoma, nodular melanoma (NM, also including the subtype Polypoid melanoma), mucosal melanoma, desmoplastic melanoma, amelanotic melanoma, and soft-tissue melanoma.

The invention also provides a method for the treatment or amelioration of a melanoma disease or a metastatic melanoma disease, comprising the step of administering to a subject in need thereof the antibody construct of the invention or the antibody construct produced according to the process of the invention.

The terms “subject in need” or those “in need of treatment” includes those already with the disorder, as well as those in which the disorder is to be prevented. The subject in need or “patient” includes human and other mammalian subjects that receive either prophylactic or therapeutic treatment.

The antibody construct of the invention will generally be designed for specific routes and methods of administration, for specific dosages and frequencies of administration, for specific treatments of specific diseases, with ranges of bio-availability and persistence, among other things. The materials of the composition are preferably formulated in concentrations that are acceptable for the site of administration.

Formulations and compositions thus may be designed in accordance with the invention for delivery by any suitable route of administration. In the context of the present invention, the routes of administration include, but are not limited to

-   -   topical routes (such as epicutaneous, inhalational, nasal,         opthalmic, auricular/aural, vaginal, mucosal);     -   enteral routes (such as oral, gastrointestinal, sublingual,         sublabial, buccal, rectal); and     -   parenteral routes (such as intravenous, intraarterial,         intraosseous, intramuscular, intracerebral,         intracerebroventricular, epidural, intrathecal, subcutaneous,         intraperitoneal, extra-amniotic, intraarticular, intracardiac,         intradermal, intralesional, intrauterine, intravesical,         intravitreal, transdermal, intranasal, transmucosal,         intrasynovial, intraluminal).

The pharmaceutical compositions and the antibody construct of this invention are particularly useful for parenteral administration, e.g., subcutaneous or intravenous delivery, for example by injection such as bolus injection, or by infusion such as continuous infusion. Pharmaceutical compositions may be administered using a medical device. Examples of medical devices for administering pharmaceutical compositions are described in U.S. Pat. Nos. 4,475,196; 4,439,196; 4,447,224; 4,447, 233; 4,486,194; 4,487,603; 4,596,556; 4,790,824; 4,941,880; 5,064,413; 5,312,335; 5,312,335; 5,383,851; and 5,399,163.

In particular, the present invention provides for an uninterrupted administration of the suitable composition. As a non-limiting example, uninterrupted or substantially uninterrupted, i.e. continuous administration may be realized by a small pump system worn by the patient for metering the influx of therapeutic agent into the body of the patient. The pharmaceutical composition comprising the antibody construct of the invention can be administered by using said pump systems. Such pump systems are generally known in the art, and commonly rely on periodic exchange of cartridges containing the therapeutic agent to be infused. When exchanging the cartridge in such a pump system, a temporary interruption of the otherwise uninterrupted flow of therapeutic agent into the body of the patient may ensue. In such a case, the phase of administration prior to cartridge replacement and the phase of administration following cartridge replacement would still be considered within the meaning of the pharmaceutical means and methods of the invention together make up one “uninterrupted administration” of such therapeutic agent.

The continuous or uninterrupted administration of the antibody constructs of the invention may be intravenous or subcutaneous by way of a fluid delivery device or small pump system including a fluid driving mechanism for driving fluid out of a reservoir and an actuating mechanism for actuating the driving mechanism. Pump systems for subcutaneous administration may include a needle or a cannula for penetrating the skin of a patient and delivering the suitable composition into the patient's body. Said pump systems may be directly fixed or attached to the skin of the patient independently of a vein, artery or blood vessel, thereby allowing a direct contact between the pump system and the skin of the patient. The pump system can be attached to the skin of the patient for 24 hours up to several days. The pump system may be of small size with a reservoir for small volumes. As a non-limiting example, the volume of the reservoir for the suitable pharmaceutical composition to be administered can be between 0.1 and 50 ml.

The continuous administration may also be transdermal by way of a patch worn on the skin and replaced at intervals. One of skill in the art is aware of patch systems for drug delivery suitable for this purpose. It is of note that transdermal administration is especially amenable to uninterrupted administration, as exchange of a first exhausted patch can advantageously be accomplished simultaneously with the placement of a new, second patch, for example on the surface of the skin immediately adjacent to the first exhausted patch and immediately prior to removal of the first exhausted patch. Issues of flow interruption or power cell failure do not arise.

If the pharmaceutical composition has been lyophilized, the lyophilized material is first reconstituted in an appropriate liquid prior to administration. The lyophilized material may be reconstituted in, e.g., bacteriostatic water for injection (BWFI), physiological saline, phosphate buffered saline (PBS), or the same formulation the protein had been in prior to lyophilization.

The compositions of the present invention can be administered to the subject at a suitable dose which can be determined e.g. by dose escalating studies by administration of increasing doses of the antibody construct of the invention exhibiting cross-species specificity described herein to non-chimpanzee primates, for instance macaques. As set forth above, the antibody construct of the invention exhibiting cross-species specificity described herein can be advantageously used in identical form in preclinical testing in non-chimpanzee primates and as drug in humans. The dosage regimen will be determined by the attending physician and clinical factors. As is well known in the medical arts, dosages for any one patient depend upon many factors, including the patient's size, body surface area, age, the particular compound to be administered, sex, time and route of administration, general health, and other drugs being administered concurrently.

The term “effective dose” or “effective dosage” is defined as an amount sufficient to achieve or at least partially achieve the desired effect. The term “therapeutically effective dose” is defined as an amount sufficient to cure or at least partially arrest the disease and its complications in a patient already suffering from the disease. Amounts or doses effective for this use will depend on the condition to be treated (the indication), the delivered antibody construct, the therapeutic context and objectives, the severity of the disease, prior therapy, the patient's clinical history and response to the therapeutic agent, the route of administration, the size (body weight, body surface or organ size) and/or condition (the age and general health) of the patient, and the general state of the patient's own immune system. The proper dose can be adjusted according to the judgment of the attending physician such that it can be administered to the patient once or over a series of administrations, and in order to obtain the optimal therapeutic effect.

A typical dosage may range from about 0.1 μg/kg to up to about 30 mg/kg or more, depending on the factors mentioned above. In specific embodiments, the dosage may range from 1.0 μg/kg up to about 20 mg/kg, optionally from 10 μg/kg up to about 10 mg/kg or from 100 μg/kg up to about 5 mg/kg.

A therapeutic effective amount of an antibody construct of the invention preferably results in a decrease in severity of disease symptoms, an increase in frequency or duration of disease symptom-free periods or a prevention of impairment or disability due to the disease affliction. For treating CDH19-expressing tumors, a therapeutically effective amount of the antibody construct of the invention, e.g. an anti-CDH19/anti-CD3 antibody construct, preferably inhibits cell growth or tumor growth by at least about 20%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, or at least about 90% relative to untreated patients. The ability of a compound to inhibit tumor growth may be evaluated in an animal model predictive of efficacy in human tumors.

The pharmaceutical composition can be administered as a sole therapeutic or in combination with additional therapies such as anti-cancer therapies as needed, e.g. other proteinaceous and non-proteinaceous drugs. These drugs may be administered simultaneously with the composition comprising the antibody construct of the invention as defined herein or separately before or after administration of said antibody construct in timely defined intervals and doses.

The term “effective and non-toxic dose” as used herein refers to a tolerable dose of an inventive antibody construct which is high enough to cause depletion of pathologic cells, tumor elimination, tumor shrinkage or stabilization of disease without or essentially without major toxic effects. Such effective and non-toxic doses may be determined e.g. by dose escalation studies described in the art and should be below the dose inducing severe adverse side events (dose limiting toxicity, DLT).

The term “toxicity” as used herein refers to the toxic effects of a drug manifested in adverse events or severe adverse events. These side events might refer to a lack of tolerability of the drug in general and/or a lack of local tolerance after administration. Toxicity could also include teratogenic or carcinogenic effects caused by the drug.

The term “safety”, “in vivo safety” or “tolerability” as used herein defines the administration of a drug without inducing severe adverse events directly after administration (local tolerance) and during a longer period of application of the drug. “Safety”, “in vivo safety” or “tolerability” can be evaluated e.g. at regular intervals during the treatment and follow-up period. Measurements include clinical evaluation, e.g. organ manifestations, and screening of laboratory abnormalities. Clinical evaluation may be carried out and deviations to normal findings recorded/coded according to NCI-CTC and/or MedDRA standards. Organ manifestations may include criteria such as allergy/immunology, blood/bone marrow, cardiac arrhythmia, coagulation and the like, as set forth e.g. in the Common Terminology Criteria for adverse events v3.0 (CTCAE). Laboratory parameters which may be tested include for instance hematology, clinical chemistry, coagulation profile and urine analysis and examination of other body fluids such as serum, plasma, lymphoid or spinal fluid, liquor and the like. Safety can thus be assessed e.g. by physical examination, imaging techniques (i.e. ultrasound, x-ray, CT scans, Magnetic Resonance Imaging (MRI), other measures with technical devices (i.e. electrocardiogram), vital signs, by measuring laboratory parameters and recording adverse events. For example, adverse events in non-chimpanzee primates in the uses and methods according to the invention may be examined by histopathological and/or histochemical methods.

The above terms are also referred to e.g. in the Preclinical safety evaluation of biotechnology-derived pharmaceuticals S6; ICH Harmonised Tripartite Guideline; ICH Steering Committee meeting on Jul. 16, 1997.

In a further embodiment, the invention provides a kit comprising an antibody construct of the invention, an antibody construct produced according to the process of the invention, a vector of the invention, and/or a host cell of the invention.

In the context of the present invention, the term “kit” means two or more components—one of which corresponding to the antibody construct, the pharmaceutical composition, the vector or the host cell of the invention—packaged together in a container, recipient or otherwise. A kit can hence be described as a set of products and/or utensils that are sufficient to achieve a certain goal, which can be marketed as a single unit.

The kit may comprise one or more recipients (such as vials, ampoules, containers, syringes, bottles, bags) of any appropriate shape, size and material (preferably waterproof, e.g. plastic or glass) containing the antibody construct or the pharmaceutical composition of the present invention in an appropriate dosage for administration (see above). The kit may additionally contain directions for use (e.g. in the form of a leaflet or instruction manual), means for administering the antibody construct of the present invention such as a syringe, pump, infuser or the like, means for reconstituting the antibody construct of the invention and/or means for diluting the antibody construct of the invention.

The invention also provides kits for a single-dose administration unit. The kit of the invention may also contain a first recipient comprising a dried/lyophilized antibody construct and a second recipient comprising an aqueous formulation. In certain embodiments of this invention, kits containing single-chambered and multi-chambered pre-filled syringes (e.g., liquid syringes and lyosyringes) are provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1: Binding of CDH19 specific BiTE antibodies to human CDH19 expressing HEK293 cells. CHO cell culture supernatant was used as first step reagent for an immunofluorescence staining of human CDH19 expressing HEK293 cells, followed by detection with a mouse anti-His and a phycoerythrin-conjugated anti-mouse antibody. The fluorescence was determined by flow cytometry.

FIG. 2: Binding of CDH19 specific BiTE antibodies to cynomolgus CDH19 expressing HEK293 cells. CHO cell culture supernatant was used as first step reagent for an immunofluorescence staining of cynomolgus CDH19 expressing HEK293 cells, followed by detection with a mouse anti-His and a phycoerythrin-conjugated anti-mouse antibody. The fluorescence was determined by flow cytometry.

FIG. 3: Binding of CDH19 specific BiTE antibodies to untransfected HEK293 cells. CHO cell culture supernatant was used as first step reagent for an immunofluorescence staining of untransfected HEK293 cells, followed by detection with a mouse anti-His and a phycoerythrin-conjugated anti-mouse antibody. The fluorescence was determined by flow cytometry.

FIG. 4: Binding of CDH19 specific BiTE antibodies to the cell line CHL-1. CHO cell culture supernatant was used as first step reagent for an immunofluorescence staining of CHL-1 cells, followed by detection with a mouse anti-His and a phycoerythrin-conjugated anti-mouse antibody. The fluorescence was determined by flow cytometry.

FIG. 5: Human and/or chicken chimera constructs used for the Epitope Prediction for the CDH19 binding domains of the invention.

A=huCDH19(44-772) (see SEQ ID NO: 1843) J=ckCDH19(44-776) (see SEQ ID NO: 1837) K=huCDH19(44-141)::ckCDH19(142-776) (see SEQ ID NO: 1838) L=ckCDH19(44-141)::huCDH19(142-249)::ckCDH19(250-776) (see SEQ ID NO: 1839) M=ckCDH19(44-249)::huCDH19(250-364)::ckCDH19(365-776) (see SEQ ID NO: 1840) N=ckCDH19(44-364)::huCDH19(365-463)::ckCDH19(469-776) (see SEQ ID NO: 1841) O=ckCDH19(44-468)::huCDH19(464-772) (see SEQ ID NO: 1842)

FIG. 6: Epitope clustering of anti-CDH19 scFv shown by flowcytometry

On chimeric chicken/human CDH19-constructs sharing representative examples of each epitope cluster found within the totality of tested CDH19-binders. HEK cells transfected with chicken or human CDH19, or with chimeric CDH19 molecules were used for epitope mapping of periplasmic extracts containing anti-human and macaque CDH19-scFv. Bound scFv were detected with an anti-HIS antibody and a PE-labeled anti-mouse Fc gamma-specific antibody. Left: designation of CDH19 scFv, top row: term of transfected HEK cells. Histogram figures: red box: gain of binding due to exchange of the chicken CDH19 sequence by the homologous human CDH19 sequence thus identifying the epitope or part of the epitope of the tested scFv. Abbreviations: wt: wildtype, hu: human, ck: chicken.

It should be understood that the inventions herein are not limited to particular methodology, protocols, or reagents, as such can vary. The discussion and examples provided herein are presented for the purpose of describing particular embodiments only and are not intended to limit the scope of the present invention, which is defined solely by the claims.

All publications and patents cited throughout the text of this specification (including all patents, patent applications, scientific publications, manufacturer's specifications, instructions, etc.), whether supra or infra, are hereby incorporated by reference in their entirety. Nothing herein is to be construed as an admission that the invention is not entitled to antedate such disclosure by virtue of prior invention. To the extent the material incorporated by reference contradicts or is inconsistent with this specification, the specification will supersede any such material.

EXAMPLES

The following examples are provided for the purpose of illustrating specific embodiments or features of the present invention. These examples should not be construed as to limit the scope of this invention. The examples are included for purposes of illustration, and the present invention is limited only by the claims.

Example 1 Interspecies CDH19 Cross-Reactivity

To confirm binding to human and cynomolgus CDH19, 46 different CDH19 BiTE antibodies were tested by flow cytometry using the following cell lines: i) HEK293 cells transfected with N-terminally FLAG-tagged human CDH19, ii) HEK293 cells transfected with N-terminally FLAG-tagged cynomolgus CDH19, iii) untransfected HEK293 cells, iv) the human melanoma cell line CHL-1 expressing native human CDH19 (Table 1).

For flow cytometry 200,000 cells of the respective cell lines were incubated on ice for 30 min with 50 μl of CHO cell culture supernatant containing secreted BiTE molecules. Cell culture supernatant of untransfected cells was used as a negative control. The cells were washed twice in PBS/1% FCS/0.05% Na-Azide and binding of the constructs was detected with a murine anti-His antibody (clone AD1.1.10, AbD Serotec), diluted 1:1000 in 50 μl PBS/1% FCS/0.05% Na-Azide). After washing, bound anti-His antibodies were detected with a phycoerythrin-conjugated mouse Fc gamma-specific antibody (Dianova), diluted 1:100 in PBS/1% FCS/0.05% Na-Azide. Fluorescence signals of the cells were measured by flow cytometry on a FACSCanto II instrument and analyzed by FACSDiva software (both from Becton Dickinson).

As a result, the CDH19/CD3 bispecific antibodies stained HEK293 cells transfected with human CDH19, cynomolgus CDH19 and the human CDH19-expressing melanoma cell line CHL-1. Moreover, no staining of untransfected HEK293 cells could be observed (see Figure—Figure). BiTE antibody 23 shows only weak binding to HEK293 cells expressing human CDH19 or cynomolgus CDH19 but clear binding to CHL-1 cells indicating a N-terminal CDH19 epitope which may be altered by the N-FLAG-tag of the recombinantly expressed CDH19 proteins on the respective transfected HEK293 cells.

TABLE 1 CDH19 BiTE antibodies and assigned numbers. BiTE antibody BiTE antibody name number CH19_4-H8 1 CH19_6-A7 2 CH19_6-B8 3 CH19_6-C12 4 CH19_6-E12 5 CH19_6-F9 6 CH19_6-G8 7 CH19_4-A7 8 CH19_9-F1 9 CH19_9-F9 10 CH19_0-B4 11 CH19_0-C11 12 CH19_1-H8 13 CH19_2-E4 14 CH19_0-B8 15 CH19_0-C4 16 CH19_0-G4 17 CH19_0-H5 18 CH19_1-B12 19 CH19_1-D11 20 CH19_1-G11 21 CH19_1-H11 22 CH19_2-G6 23 CH19_5-G4 24 CH19_8-F6 25 CH19_0-G9 26 CH19_2-A10 27 CH19_2-D9 28 CH19_2-H7 29 CH19_0-E11 30 CH19_1-E11 31 CH19_8-H6 32 CH19_8-H7 33 CH19_9-C2 34 CH19_9-F3 35 CH19_0-F5 36 CH19_1-E1 37 CH19_1-E6 38 CH19_3-B10 39 CH19_3-F2 40 CH19_2-C11 41 CH19_3-D5 42 CH19_5-B3 43 CH19_5-E10 44 CH19_6-G10 45 CH19_203-VKG 46

Example 2 Cytotoxic Activity

Target Cell Labeling

For the analysis of cell lysis in flow cytometry assays, the fluorescent membrane dye DiOC18 (DiO) (Molecular Probes, #V22886) was used to label cynomolgus CDH19 positive CHO cells—as target cells and distinguish them from effector cells. Briefly, cells were harvested, washed once with PBS and adjusted to 106 cell/mL in PBS containing 2% (v/v) FBS and the membrane dye DiO (5 μL/106 cells). After incubation for 3 min at 37° C., cells were washed twice in complete RPMI medium and the cell number adjusted to 1.25×105 cells/mL. The vitality of cells was determined using 0.5% (v/v) isotonic EosinG solution (Roth, #45380).

Flow Cytometry Based Analysis

This assay was designed to quantify the lysis of cynomolgus CDH19-transfected CHO cells in the presence of serial dilutions of CDH19 bispecific antibodies.

Equal volumes of DiO-labeled target cells and effector cells (i.e. CD3-expressing macaque T cell line 4119LnPx) were mixed, resulting in an E:T cell ratio of 10:1. 160 μL of this suspension were transferred to each well of a 96-well plate. 40 μL of serial dilutions of the CDH19 bispecific antibodies and a negative control bispecific (an CD3-based bispecific antibody recognizing an irrelevant target antigen) or RPMI complete medium as an additional negative control were added. The bispecific antibody-mediated cytotoxic reaction proceeded for 48 hours in a 7% CO2 humidified incubator. Then cells were transferred to a new 96-well plate and loss of target cell membrane integrity was monitored by adding propidium iodide (PI) at a final concentration of 1 μg/mL. PI is a membrane impermeable dye that normally is excluded from viable cells, whereas dead cells take it up and become identifiable by fluorescent emission.

Samples were measured by flow cytometry on a FACSCanto II instrument and analyzed by FACSDiva software (both from Becton Dickinson).

Target cells were identified as DiO-positive cells. PI-negative target cells were classified as living target cells. Percentage of cytotoxicity was calculated according to the following formula:

${{Cytotoxicity}\mspace{14mu}\lbrack\%\rbrack} = {\frac{n_{{dead}\mspace{14mu} {target}\mspace{14mu} {cells}}}{n_{{target}\mspace{14mu} {cells}}} \times 100}$ n = number   of  events

Using GraphPad Prism 6 software (Graph Pad Software, San Diego), the percentage of cytotoxicity was plotted against the corresponding bispecific antibody concentrations. Dose response curves were analyzed with the four parametric logistic regression models for evaluation of sigmoid dose response curves with fixed hill slope and EC50 values were calculated.

Example 3 Epitope Prediction by Human/Chicken Cadherin-19 Chimeras

Domain binding was determined by flowcytometry on 293T cells transiently transfected with plasmids consisting of single human CDH19 cadherin repeat domain replacements into the chicken Cadherin19 backbone cloned into the pTTS expression vector immediately preceded by native human or chicken CDH19 leader sequences and a Flag tag. The experiment included assaying a subset of anti-CDH19 antibodies against chicken Cadherin19 to determine suitability for binning on these human/chicken chimeras.

The following binding assay was completed in 96-well V-bottom plates. 50,000 transiently transfected 293T cells were incubated with periplasmic extracts containing scFv binding to human and macaque CDH19. Bound scFv were detected with 1 μg/ml of a monoclonal mouse anti-HIS antibody (AbD Serotec MCA1396). After washing, bound anti-His antibodies were detected with a Fc gamma-specific antibody conjugated to phycoerythrin (Jackson-Immuno-Research 115-116-071) diluted 1:100.

Cells were then washed one time and measured by flowcytometry on a FACS Calibur instrument (Becton Dickinson) and analyzed by FlowJo software (Version 7.6).

The experiments included HEK 293 controls. As negative control, cells were incubated in PBS with 2% FCS instead of periplasmic extracts containing anti-CDH19 scFv.

The FLAG tag was detected with 1 μg/ml of a FLAG M2 antibody (Sigma F1804) followed by a Fc gamma-specific antibody conjugated to phycoerythrin (Jackson-Immuno-Research 115-116-071).

Antibodies used for this assay (anti-HIS antibody (AbD Serotec MCA1396), FLAG M2 antibody (Sigma F1804) and the PE-labeled Fc gamma-specific antibody (Jackson-Immuno-Research 115-116-071) were diluted in PBS with 2% FCS. Cells were incubated with the respective antibodies for 30 minutes at 4° C.

The data from these experiments are presented in FIGS. 5 and 6. Table 2 summarises the conclusion of those assay for the antibody constructs of the invention.

TABLE 2 Epitope Cluster prediction for CDH19 antibody constructs of the invention Epi- Epi- tope tope clus- clus- Clon ter Clon ter CH19_2G6_302_VKG×I2C6 E3 CH19_2-H7×I2C6 E1 CH19_0-E11×I2C6 E1 CH19_5-B3×I2C6 E3 CH19_5-G4×I2C6 E1 CH19_5-E10×I2C6 E3 CH19_8-H6×I2C6 E1 CH19_6-G10×I2C6 E3 CH19_2-C11×I2C6 E1 CH19_4-H8×I2C6 E3 CH19_2-A10×I2C6 E1 CH19_2-E4×I2C6 E3 CH19_1-D11 ×I2C6 E1 CH19_6-B8×I2C6 E3 CH19_9-F9×I2C6 E1 CH19_0-B4×I2C6 E3 CH19_1-H8×I2C6 E1 CH19_9-F1×I2C6 E3 CH19_1-B12×I2C6 E1 CH19_4-A7×I2C6 E3 CH19_0-C4×I2C6 E1 CH19_6-E12×I2C6 E3 CH19_3-F2×I2C6 E1 CH19_6-C12×I2C6 E3 CH19_3-B10×I2C6 E1 CH19_6-A7×I2C6 E3 CH19_0-G4×I2C6 E1 CH19_6-G8×I2C6 E3 CH19_0-H5×I2C6 E1 CH19_6-F9×I2C6 E3 CH19_0-B8×I2C6 E1 CH19_0-C11×I2C6 E1 CH19_2-D9×I2C6 E1 CH19_8-F6×I2C6 E1 CH19_8-H7×I2C6 E1 CH19_0-G9×I2C6 E1 CH19_9-C2×I2C6 E1 CH19_1-E11×I2C6 E1 CH19_3-D5×I2C6 E1 CH19_0-F5×I2C6 E1 CH19_1-G11×I2C6 E1 CH19_1-E1×I2C6 E1 CH19_1-H11×I2C6 E1 CH19_1-E6×I2C6 E1 CH19_9-F3×I2C6 E1 CH19_2G6_302×I2C6 E3 CH19_2-G6×I2C6 E1

The following table provides sequence identifiers and descriptions for the sequences provided in the sequence listing (the table can be read by scrolling down each column and proceeding left-to-right across columns on a given page).

Sequence Table Ab HCDR1 HCDR2 HCDR3 LCDR1 LCDR2 LCDR3 CH19_2G6_302_VKGxI2C6 (SEQ ID 1) (SEQ ID 2) (SEQ ID 3) (SEQ ID 4) (SEQ ID 5) (SEQ ID 6) CH19_0- (SEQ ID 14) (SEQ ID 15) (SEQ ID 16) (SEQ ID 17) (SEQ ID 18) (SEQ ID 19) E11xI2C6 CH19_5- (SEQ ID 27) (SEQ ID 28) (SEQ ID 29) (SEQ ID 30) (SEQ ID 31) (SEQ ID 32) G4xI2C6 CH19_8- (SEQ ID 40) (SEQ ID 41) (SEQ ID 42) (SEQ ID 43) (SEQ ID 44) (SEQ ID 45) H6xI2C6 CH19_2- (SEQ ID 53) (SEQ ID 54) (SEQ ID 55) (SEQ ID 56) (SEQ ID 57) (SEQ ID 58) C11xI2C6 CH19_2- (SEQ ID 66) (SEQ ID 67) (SEQ ID 68) (SEQ ID 69) (SEQ ID 70) (SEQ ID 71) A10xI2C6 CH19_1-D11xI2C6 (SEQ ID 79) (SEQ ID 80) (SEQ ID 81) (SEQ ID 82) (SEQ ID 83) (SEQ ID 84) CH19_9- (SEQ ID 92) (SEQ ID 93) (SEQ ID 94) (SEQ ID 95) (SEQ ID 96) (SEQ ID 97) F9xI2C6 CH19_1- (SEQ ID 105) (SEQ ID 106) (SEQ ID 107) (SEQ ID 108) (SEQ ID 109) (SEQ ID 110) H8xI2C6 CH19_1- (SEQ ID 118) (SEQ ID 119) (SEQ ID 120) (SEQ ID 121) (SEQ ID 122) (SEQ ID 123) B12xI2C6 CH19_0- (SEQ ID 131) (SEQ ID 132) (SEQ ID 133) (SEQ ID 134) (SEQ ID 135) (SEQ ID 136) C4xI2C6 CH19_3- (SEQ ID 144) (SEQ ID 145) (SEQ ID 146) (SEQ ID 147) (SEQ ID 148) (SEQ ID 149) F2xI2C6 CH19_3- (SEQ ID 157) (SEQ ID 158) (SEQ ID 159) (SEQ ID 160) (SEQ ID 161) (SEQ ID 162) B10xI2C6 CH19_0- (SEQ ID 170) (SEQ ID 171) (SEQ ID 172) (SEQ ID 173) (SEQ ID 174) (SEQ ID 175) G4xI2C6 CH19_0- (SEQ ID 183) (SEQ ID 184) (SEQ ID 185) (SEQ ID 186) (SEQ ID 187) (SEQ ID 188) H5xI2C6 CH19_0- (SEQ ID 196) (SEQ ID 197) (SEQ ID 198) (SEQ ID 199) (SEQ ID 200) (SEQ ID 201) B8xI2C6 CH19_2- (SEQ ID 209) (SEQ ID 210) (SEQ ID 211) (SEQ ID 212) (SEQ ID 213) (SEQ ID 214) D9xI2C6 CH19_8- (SEQ ID 222) (SEQ ID 223) (SEQ ID 224) (SEQ ID 225) (SEQ ID 226) (SEQ ID 227) H7xI2C6 CH19_9- (SEQ ID 235) (SEQ ID 236) (SEQ ID 237) (SEQ ID 238) (SEQ ID 239) (SEQ ID 240) C2xI2C6 CH19_3- (SEQ ID 248) (SEQ ID 249) (SEQ ID 250) (SEQ ID 251) (SEQ ID 252) (SEQ ID 253) D5xI2C6 CH19_1- (SEQ ID 261) (SEQ ID 262) (SEQ ID 263) (SEQ ID 264) (SEQ ID 265) (SEQ ID 266) G11xI2C6 CH19_1- (SEQ ID 274) (SEQ ID 275) (SEQ ID 276) (SEQ ID 277) (SEQ ID 278) (SEQ ID 279) H11xI2C6 CH19_9- (SEQ ID 287) (SEQ ID 288) (SEQ ID 289) (SEQ ID 290) (SEQ ID 291) (SEQ ID 292) F3xI2C6 CH19_2- (SEQ ID 300) (SEQ ID 301) (SEQ ID 302) (SEQ ID 303) (SEQ ID 304) (SEQ ID 305) G6xI2C6 CH19_2- (SEQ ID 313) (SEQ ID 314) (SEQ ID 315) (SEQ ID 316) (SEQ ID 317) (SEQ ID 318) H7xI2C6 CH19_5- (SEQ ID 326) (SEQ ID 327) (SEQ ID 328) (SEQ ID 329) (SEQ ID 330) (SEQ ID 331) B3xI2C6 CH19_5- (SEQ ID 339) (SEQ ID 340) (SEQ ID 341) (SEQ ID 342) (SEQ ID 343) (SEQ ID 344) E10xI2C6 CH19_6- (SEQ ID 352) (SEQ ID 353) (SEQ ID 354) (SEQ ID 355) (SEQ ID 356) (SEQ ID 357) G10xI2C6 CH19_4- (SEQ ID 365) (SEQ ID 366) (SEQ ID 367) (SEQ ID 368) (SEQ ID 369) (SEQ ID 370) H8xI2C6 CH19_2- (SEQ ID 378) (SEQ ID 379) (SEQ ID 380) (SEQ ID 381) (SEQ ID 382) (SEQ ID 383) E4xI2C6 CH19_6- (SEQ ID 391) (SEQ ID 392) (SEQ ID 393) (SEQ ID 394) (SEQ ID 395) (SEQ ID 396) B8xI2C6 CH19_0- (SEQ ID 404) (SEQ ID 405) (SEQ ID 406) (SEQ ID 407) (SEQ ID 408) (SEQ ID 409) B4xI2C6 CH19_9- (SEQ ID 417) (SEQ ID 418) (SEQ ID 419) (SEQ ID 420) (SEQ ID 421) (SEQ ID 422) F1xI2C6 CH19_4- (SEQ ID 430) (SEQ ID 431) (SEQ ID 432) (SEQ ID 433) (SEQ ID 434) (SEQ ID 435) A7xI2C6 CH19_6- (SEQ ID 443) (SEQ ID 444) (SEQ ID 445) (SEQ ID 446) (SEQ ID 447) (SEQ ID 448) E12xI2C6 CH19_6- (SEQ ID 456) (SEQ ID 457) (SEQ ID 458) (SEQ ID 459) (SEQ ID 460) (SEQ ID 461) C12xI2C6 CH19_6- (SEQ ID 469) (SEQ ID 470) (SEQ ID 471) (SEQ ID 472) (SEQ ID 473) (SEQ ID 474) A7xI2C6 CH19_6- (SEQ ID 482) (SEQ ID 483) (SEQ ID 484) (SEQ ID 485) (SEQ ID 486) (SEQ ID 487) G8xI2C6 CH19_6- (SEQ ID 495) (SEQ ID 496) (SEQ ID 497) (SEQ ID 498) (SEQ ID 499) (SEQ ID 500) F9xI2C6 CH19_0- (SEQ ID 508) (SEQ ID 509) (SEQ ID 510) (SEQ ID 511) (SEQ ID 512) (SEQ ID 513) C11xI2C6 CH19_8- (SEQ ID 521) (SEQ ID 522) (SEQ ID 523) (SEQ ID 524) (SEQ ID 525) (SEQ ID 526) F6xI2C6 CH19_0- (SEQ ID 534) (SEQ ID 535) (SEQ ID 536) (SEQ ID 537) (SEQ ID 538) (SEQ ID 539) G9xI2C6 CH19_1- (SEQ ID 547) (SEQ ID 548) (SEQ ID 549) (SEQ ID 550) (SEQ ID 551) (SEQ ID 552) E11xI2C6 CH19_0- (SEQ ID 560) (SEQ ID 561) (SEQ ID 562) (SEQ ID 563) (SEQ ID 564) (SEQ ID 565) F5xI2C6 CH19_1- (SEQ ID 573) (SEQ ID 574) (SEQ ID 575) (SEQ ID 576) (SEQ ID 577) (SEQ ID 578) E1xI2C6 CH19_1- (SEQ ID 586) (SEQ ID 587) (SEQ ID 588) (SEQ ID 589) (SEQ ID 590) (SEQ ID 591) E6xI2C6 CH19_2G6_302xI2C6 (SEQ ID 599) (SEQ ID 600) (SEQ ID 601) (SEQ ID 602) (SEQ ID 603) (SEQ ID 604) Ab LC V-region HC V-region CH19_2G6_302_VKGxI2C6 (SEQ ID 9) (SEQ ID 7) (SEQ ID 10) (SEQ ID 8) CH19_0- (SEQ ID 22) (SEQ ID 20) E11xI2C6 (SEQ ID 23) (SEQ ID 21) CH19_5- (SEQ ID 35) (SEQ ID 33) G4xI2C6 (SEQ ID 36) (SEQ ID 34) CH19_8- (SEQ ID 48) (SEQ ID 46) H6xI2C6 (SEQ ID 49) (SEQ ID 47) CH19_2- (SEQ ID 61) (SEQ ID 59) C11xI2C6 (SEQ ID 62) (SEQ ID 60) CH19_2- (SEQ ID 74) (SEQ ID 72) A10xI2C6 (SEQ ID 75) (SEQ ID 73) CH19_1- (SEQ ID 87) (SEQ ID 85) D11xI2C6 (SEQ ID 88) (SEQ ID 86) CH19_9- (SEQ ID 100) (SEQ ID 98) F9xI2C6 (SEQ ID 101) (SEQ ID 99) CH19_1- (SEQ ID 113) (SEQ ID 111) H8xI2C6 (SEQ ID 114) (SEQ ID 112) CH19_1- (SEQ ID 126) (SEQ ID 124) B12xI2C6 (SEQ ID 127) (SEQ ID 125) CH19_0- (SEQ ID 139) (SEQ ID 137) C4xI2C6 (SEQ ID 140) (SEQ ID 138) CH19_3- (SEQ ID 152) (SEQ ID 150) F2xI2C6 (SEQ ID 153) (SEQ ID 151) CH19_3- (SEQ ID 165) (SEQ ID 163) B10xI2C6 (SEQ ID 166) (SEQ ID 164) CH19_0- (SEQ ID 178) (SEQ ID 176) G4xI2C6 (SEQ ID 179) (SEQ ID 177) CH19_0- (SEQ ID 191) (SEQ ID 189) H5xI2C6 (SEQ ID 192) (SEQ ID 190) CH19_0- (SEQ ID 204) (SEQ ID 202) B8xI2C6 (SEQ ID 205) (SEQ ID 203) CH19_2- (SEQ ID 217) (SEQ ID 215) D9xI2C6 (SEQ ID 218) (SEQ ID 216) CH19_8- (SEQ ID 230) (SEQ ID 228) H7xI2C6 (SEQ ID 231) (SEQ ID 229) CH19_9- (SEQ ID 243) (SEQ ID 241) C2xI2C6 (SEQ ID 244) (SEQ ID 242) CH19_3- (SEQ ID 256) (SEQ ID 254) D5xI2C6 (SEQ ID 257) (SEQ ID 255) CH19_1- (SEQ ID 269) (SEQ ID 267) G11xI2C6 (SEQ ID 270) (SEQ ID 268) CH19_1- (SEQ ID 282) (SEQ ID 280) H11xI2C6 (SEQ ID 283) (SEQ ID 281) CH19_9- (SEQ ID 295) (SEQ ID 293) F3xI2C6 (SEQ ID 296) (SEQ ID 294) CH19_2- (SEQ ID 308) (SEQ ID 306) G6xI2C6 (SEQ ID 309) (SEQ ID 307) CH19_2- (SEQ ID 321) (SEQ ID 319) H7xI2C6 (SEQ ID 322) (SEQ ID 320) CH19_5- (SEQ ID 334) (SEQ ID 332) B3xI2C6 (SEQ ID 335) (SEQ ID 333) CH19_5- (SEQ ID 347) (SEQ ID 345) E10xI2C6 (SEQ ID 348) (SEQ ID 346) CH19_6- (SEQ ID 360) (SEQ ID 358) G10xI2C6 (SEQ ID 361) (SEQ ID 359) CH19_4- (SEQ ID 373) (SEQ ID 371) H8xI2C6 (SEQ ID 374) (SEQ ID 372) CH19_2- (SEQ ID 386) (SEQ ID 384) E4xI2C6 (SEQ ID 387) (SEQ ID 385) CH19_6- (SEQ ID 399) (SEQ ID 397) B8xI2C6 (SEQ ID 400) (SEQ ID 398) CH19_0- (SEQ ID 412) (SEQ ID 410) B4xI2C6 (SEQ ID 413) (SEQ ID 411) CH19_9- (SEQ ID 425) (SEQ ID 423) F1xI2C6 (SEQ ID 426) (SEQ ID 424) CH19_4- (SEQ ID 438) (SEQ ID 436) A7xI2C6 (SEQ ID 439) (SEQ ID 437) CH19_6- (SEQ ID 451) (SEQ ID 449) E12xI2C6 (SEQ ID 452) (SEQ ID 450) CH19_6- (SEQ ID 464) (SEQ ID 462) C12xI2C6 (SEQ ID 465) (SEQ ID 463) CH19_6- (SEQ ID 477) (SEQ ID 475) A7xI2C6 (SEQ ID 478) (SEQ ID 476) CH19_6- (SEQ ID 490) (SEQ ID 488) G8xI2C6 (SEQ ID 491) (SEQ ID 489) CH19_6- (SEQ ID 503) (SEQ ID 501) F9xI2C6 (SEQ ID 504) (SEQ ID 502) CH19_0- (SEQ ID 516) (SEQ ID 514) C11xI2C6 (SEQ ID 517) (SEQ ID 515) CH19_8- (SEQ ID 529) (SEQ ID 527) F6xI2C6 (SEQ ID 530) (SEQ ID 528) CH19_0- (SEQ ID 542) (SEQ ID 540) G9xI2C6 (SEQ ID 543) (SEQ ID 541) CH19_1- (SEQ ID 555) (SEQ ID 553) E11xI2C6 (SEQ ID 556) (SEQ ID 554) CH19_0- (SEQ ID 568) (SEQ ID 566) F5xI2C6 (SEQ ID 569) (SEQ ID 567) CH19_1- (SEQ ID 581) (SEQ ID 579) E1xI2C6 (SEQ ID 582) (SEQ ID 580) CH19_1- (SEQ ID 594) (SEQ ID 592) E6xI2C6 (SEQ ID 595) (SEQ ID 593) CH19_2G6_302xI2C6 (SEQ ID 607) (SEQ ID 605) (SEQ ID 608) (SEQ ID 606) Ab VH-VL CH19_2G6_302_VKGxI2C6 (SEQ ID 11) (SEQ ID 12) CH19_0- (SEQ ID 24) E11xI2C6 (SEQ ID 25) CH19_5- (SEQ ID 37) G4xI2C6 (SEQ ID 38) CH19_8- (SEQ ID 50) H6xI2C6 (SEQ ID 51) CH19_2- (SEQ ID 63) C11xI2C6 (SEQ ID 64) CH19_2- (SEQ ID 76) A10xI2C6 (SEQ ID 77) CH19_1- (SEQ ID 89) D11 xI2C6 (SEQ ID 90) CH19_9- (SEQ ID 102) F9xI2C6 (SEQ ID 103) CH19_1- (SEQ ID 115) H8xI2C6 (SEQ ID 116) CH19_1- (SEQ ID 128) B12xI2C6 (SEQ ID 129) CH19_0- (SEQ ID 141) C4xI2C6 (SEQ ID 142) CH19_3- (SEQ ID 154) F2xI2C6 (SEQ ID 155) CH19_3- (SEQ ID 167) B10xI2C6 (SEQ ID 168) CH19_0- (SEQ ID 180) G4xI2C6 (SEQ ID 181) CH19_0- (SEQ ID 193) H5xI2C6 (SEQ ID 194) CH19_0- (SEQ ID 206) B8xI2C6 (SEQ ID 207) CH19_2- (SEQ ID 219) D9xI2C6 (SEQ ID 220) CH19_8- (SEQ ID 232) H7xI2C6 (SEQ ID 233) CH19_9- (SEQ ID 245) C2xI2C6 (SEQ ID 246) CH19_3- (SEQ ID 258) D5xI2C6 (SEQ ID 259) CH19_1- (SEQ ID 271) G11xI2C6 (SEQ ID 272) CH19_1- (SEQ ID 284) H11xI2C6 (SEQ ID 285) CH19_9- (SEQ ID 297) F3xI2C6 (SEQ ID 298) CH19_2- (SEQ ID 310) G6xI2C6 (SEQ ID 311) CH19_2- (SEQ ID 323) H7xI2C6 (SEQ ID 324) CH19_5- (SEQ ID 336) B3xI2C6 (SEQ ID 337) CH19_5- (SEQ ID 349) E10xI2C6 (SEQ ID 350) CH19_6- (SEQ ID 362) G10xI2C6 (SEQ ID 363) CH19_4- (SEQ ID 375) H8xI2C6 (SEQ ID 376) CH19_2- (SEQ ID 388) E4xI2C6 (SEQ ID 389) CH19_6- (SEQ ID 401) B8xI2C6 (SEQ ID 402) CH19_0- (SEQ ID 414) B4xI2C6 (SEQ ID 415) CH19_9- (SEQ ID 427) F1xI2C6 (SEQ ID 428) CH19_4- (SEQ ID 440) A7xI2C6 (SEQ ID 441) CH19_6- (SEQ ID 453) E12xI2C6 (SEQ ID 454) CH19_6- (SEQ ID 466) C12xI2C6 (SEQ ID 467) CH19_6- (SEQ ID 479) A7xI2C6 (SEQ ID 480) CH19_6- (SEQ ID 492) G8xI2C6 (SEQ ID 493) CH19_6- (SEQ ID 505) F9xI2C6 (SEQ ID 506) CH19_0- (SEQ ID 518) C11xI2C6 (SEQ ID 519) CH19_8- (SEQ ID 531) F6xI2C6 (SEQ ID 532) CH19_0- (SEQ ID 544) G9xI2C6 (SEQ ID 545) CH19_1- (SEQ ID 557) E11xI2C6 (SEQ ID 558) CH19_0- (SEQ ID 570) F5xI2C6 (SEQ ID 571) CH19_1- (SEQ ID 583) E1xI2C6 (SEQ ID 584) CH19_1- (SEQ ID 596) E6xI2C6 (SEQ ID 597) CH19_2G6_302xI2C6 (SEQ ID 609) (SEQ ID 610) CDH19 x CD3 CH19_2G6_302_VKGxI2C6 (SEQ ID 13) CH19_0- (SEQ ID 26) E11xI2C6 CH19_5- (SEQ ID 39) G4xI2C6 CH19_8- (SEQ ID 52) H6xI2C6 CH19_2- (SEQ ID 65) C11xI2C6 CH19_2- (SEQ ID 78) A10xI2C6 CH19_1- (SEQ ID 91) D11 xI2C6 CH19_9- (SEQ ID 104) F9xI2C6 CH19_1- (SEQ ID 117) H8xI2C6 CH19_1- (SEQ ID 130) B12xI2C6 CH19_0- (SEQ ID 143) C4xI2C6 CH19_3- (SEQ ID 156) F2xI2C6 CH19_3- (SEQ ID 169) B10xI2C6 CH19_0- (SEQ ID 182) G4xI2C6 CH19_0- (SEQ ID 195) H5xI2C6 CH19_0- (SEQ ID 208) B8xI2C6 CH19_2- (SEQ ID 221) D9xI2C6 CH19_8- (SEQ ID 234) H7xI2C6 CH19_9- (SEQ ID 247) C2xI2C6 CH19_3- (SEQ ID 260) D5xI2C6 CH19_1- (SEQ ID 273) G11xI2C6 CH19_1- (SEQ ID 286) H11xI2C6 CH19_9- (SEQ ID 299) F3xI2C6 CH19_2- (SEQ ID 312) G6xI2C6 CH19_2- (SEQ ID 325) H7xI2C6 CH19_5- (SEQ ID 338) B3xI2C6 CH19_5- (SEQ ID 351) E10xI2C6 CH19_6- (SEQ ID 364) G10xI2C6 CH19_4- (SEQ ID 377) H8xI2C6 CH19_2- (SEQ ID 390) E4xI2C6 CH19_6- (SEQ ID 403) B8xI2C6 CH19_0- (SEQ ID 416) B4xI2C6 CH19_9- (SEQ ID 429) F1xI2C6 CH19_4- (SEQ ID 442) A7xI2C6 CH19_6- (SEQ ID 455) E12xI2C6 CH19_6- (SEQ ID 468) C12xI2C6 CH19_6- (SEQ ID 481) A7xI2C6 CH19_6- (SEQ ID 494) G8xI2C6 CH19_6- (SEQ ID 507) F9xI2C6 CH19_0- (SEQ ID 520) C11xI2C6 CH19_8- (SEQ ID 533) F6xI2C6 CH19_0- (SEQ ID 546) G9xI2C6 CH19_1- (SEQ ID 559) E11xI2C6 CH19_0- (SEQ ID 572) F5xI2C6 CH19_1- (SEQ ID 585) E1xI2C6 CH19_1- (SEQ ID 598) E6xI2C6 CH19_2G6_302xI2C6 (SEQ ID 611) SEQ ID Designation 1. CH19_2G6_302_VKGxI2C6- 156 2. CH19_0- E11xI2C6-156 3. CH19_5-G4xI2C6- 156 4. CH19_8-H6xI2C6- 156 5. CH19_2- C11xI2C6-156 6. CH19_2- A10xI2C6-156 7. CH19_1- D11xI2C6-156 8. CH19_9-F9xI2C6- 156 9. CH19_1-H8xI2C6- 156 10. CH19_1- B12xI2C6-156 11. CH19_0-C4xI2C6- 156 12. CH19_3-F2xI2C6- 156 13. CH19_3- B10xI2C6-156 14. CH19_0-G4xI2C6- 156 15. CH19_0-H5xI2C6- 156 16. CH19_0-B8xI2C6- 156 17. CH19_2-D9xI2C6- 156 18. CH19_8-H7xI2C6- 156 19. CH19_9-C2xI2C6- 156 20. CH19_3-D5xI2C6- 156 21. CH19_1- G11xI2C6-156 22. CH19_1- H11xI2C6-156 23. CH19_9-F3xI2C6- 156 24. CH19_2-G6xI2C6- 156 25. CH19_2-H7xI2C6- 156 26. CH19_5-B3xI2C6- 156 27. CH19_5- E10xI2C6-156 28. CH19_6- G10xI2C6-156 29. CH19_4-H8xI2C6- 156 30. CH19_2-E4xI2C6- 156 31. CH19_6-B8xI2C6- 156 32. CH19_0-B4xI2C6- 156 33. CH19_9-F1xI2C6- 156 34. CH19_4-A7xI2C6- 156 35. CH19_6- E12xI2C6-156 36. CH19_6- C12xI2C6-156 37. CH19_6-A7xI2C6- 156 38. CH19_6-G8xI2C6- 156 39. CH19_6-F9xI2C6- 156 40. CH19_0- C11xI2C6-156 41. CH19_8-F6xI2C6- 156 42. CH19_0-G9xI2C6- 156 43. CH19_1- E11xI2C6-156 44. CH19_0-F5xI2C6- 156 45. CH19_1-E1xI2C6- 156 46. CH19_1-E6xI2C6- 156 47. CH19_2G6_302xI2C6- 156 48. CH19_2G6_302_VKGxI2C6- LFcBY 49. CH19_0- E11xI2C6-LFcBY 50. CH19_5-G4xI2C6- LFcBY 51. CH19_8-H6xI2C6- LFcBY 52. CH19_2- C11xI2C6-LFcBY 53. CH19_2- A10xI2C6-LFcBY 54. CH19_1- D11xI2C6-LFcBY 55. CH19_9-F9xI2C6- LFcBY 56. CH19_1-H8xI2C6- LFcBY 57. CH19_1- B12xI2C6-LFcBY 58. CH19_0-C4xI2C6- LFcBY 59. CH19_3-F2xI2C6- LFcBY 60. CH19_3- B10xI2C6-LFcBY 61. CH19_0-G4xI2C6- LFcBY 62. CH19_0-H5xI2C6- LFcBY 63. CH19_0-B8xI2C6- LFcBY 64. CH19_2-D9xI2C6- LFcBY 65. CH19_8-H7xI2C6- LFcBY 66. CH19_9-C2xI2C6- LFcBY 67. CH19_3-D5xI2C6- LFcBY 68. CH19_1- G11xI2C6-LFcBY 69. CH19_1- H11xI2C6-LFcBY 70. CH19_9-F3xI2C6- LFcBY 71. CH19_2-G6xI2C6- LFcBY 72. CH19_2-H7xI2C6- LFcBY 73. CH19_5-B3xI2C6- LFcBY 74. CH19_5- E10xI2C6-LFcBY 75. CH19_6- G10xI2C6-LFcBY 76. CH19_4-H8xI2C6- LFcBY 77. CH19_2-E4xI2C6- LFcBY 78. CH19_6-B8xI2C6- LFcBY 79. CH19_0-B4xI2C6- LFcBY 80. CH19_9-F1xI2C6- LFcBY 81. CH19_4-A7xI2C6- LFcBY 82. CH19_6- E12xI2C6-LFcBY 83. CH19_6- C12xI2C6-LFcBY 84. CH19_6-A7xI2C6- LFcBY 85. CH19_6-G8xI2C6- LFcBY 86. CH19_6-F9xI2C6- LFcBY 87. CH19_0- C11xI2C6-LFcBY 88. CH19_8-F6xI2C6- LFcBY 89. CH19_0-G9xI2C6- LFcBY 90. CH19_1- E11xI2C6-LFcBY 91. CH19_0-F5xI2C6- LFcBY 92. CH19_1-E1xI2C6- LFcBY 93. CH19_1-E6xI2C6- LFcBY 94. CH19_2G6_302xI2C6- LFcBY 95. CH19_2G6_302_VKGxI2C6- LFcBY- 156 96. CH19_0- E11xI2C6-LFcBY- 156 97. CH19_5-G4xI2C6- LFcBY-156 98. CH19_8-H6xI2C6- LFcBY-156 99. CH19_2- C11xI2C6-LFcBY- 156 100. CH19_2- A10xI2C6-LFcBY- 156 101. CH19_1- D11xI2C6-LFcBY- 156 102. CH19_9-F9xI2C6- LFcBY-156 103. CH19_1-H8xI2C6- LFcBY-156 104. CH19_1- B12xI2C6-LFcBY- 156 105. CH19_0-C4xI2C6- LFcBY-156 106. CH19_3-F2xI2C6- LFcBY-156 107. CH19_3- B10xI2C6-LFcBY- 156 108. CH19_0-G4xI2C6- LFcBY-156 109. CH19_0-H5xI2C6- LFcBY-156 110. CH19_0-B8xI2C6- LFcBY-156 111. CH19_2-D9xI2C6- LFcBY-156 112. CH19_8-H7xI2C6- LFcBY-156 113. CH19_9-C2xI2C6- LFcBY-156 114. CH19_3-D5xI2C6- LFcBY-156 115. CH19_1- G11xI2C6-LFcBY- 156 116. CH19_1- H11xI2C6-LFcBY- 156 117. CH19_9-F3xI2C6- LFcBY-156 118. CH19_2-G6xI2C6- LFcBY-156 119. CH19_2-H7xI2C6- LFcBY-156 120. CH19_5-B3xI2C6- LFcBY-156 121. CH19_5- E10xI2C6-LFcBY- 156 122. CH19_6- G10xI2C6-LFcBY- 156 123. CH19_4-H8xI2C6- LFcBY-156 124. CH19_2-E4xI2C6- LFcBY-156 125. CH19_6-B8xI2C6- LFcBY-156 126. CH19_0-B4xI2C6- LFcBY-156 127. CH19_9-F1xI2C6- LFcBY-156 128. CH19_4-A7xI2C6- LFcBY-156 129. CH19_6- E12xI2C6-LFcBY- 156 130. CH19_6- C12xI2C6-LFcBY- 156 131. CH19_6-A7xI2C6- LFcBY-156 132. CH19_6-G8xI2C6- LFcBY-156 133. CH19_6-F9xI2C6- LFcBY-156 134. CH19_0- C11xI2C6-LFcBY- 156 135. CH19_8-F6xI2C6- LFcBY-156 136. CH19_0-G9xI2C6- LFcBY-156 137. CH19_1- E11xI2C6-LFcBY- 156 138. CH19_0-F5xI2C6- LFcBY-156 139. CH19_1-E1xI2C6- LFcBY-156 140. CH19_1-E6xI2C6- LFcBY-156 141. CH19_2G6_302xI2C6- LFcBY-156 142. CH19_2G6_302_VKGxI2C6- Cys-Loop 143. CH19_0- E11xI2C6-Cys- Loop 144. CH19_5-G4xI2C6- Cys-Loop 145. CH19_8-H6xI2C6- Cys-Loop 146. CH19_2- C11xI2C6-Cys- Loop 147. CH19_2- A10xI2C6-Cys- Loop 148. CH19_1- D11xI2C6-Cys- Loop 149. CH19_9-F9xI2C6- Cys-Loop 150. CH19_1-H8xI2C6- Cys-Loop 151. CH19_1- B12xI2C6-Cys- Loop 152. CH19_0-C4xI2C6- Cys-Loop 153. CH19_3-F2xI2C6- Cys-Loop 154. CH19_3- B10xI2C6-Cys- Loop 155. CH19_0-G4xI2C6- Cys-Loop 156. CH19_0-H5xI2C6- Cys-Loop 157. CH19_0-B8xI2C6- Cys-Loop 158. CH19_2-D9xI2C6- Cys-Loop 159. CH19_8-H7xI2C6- Cys-Loop 160. CH19_9-C2xI2C6- Cys-Loop 161. CH19_3-D5xI2C6- Cys-Loop 162. CH19_1- G11xI2C6-Cys- Loop 163. CH19_1- H11xI2C6-Cys- Loop 164. CH19_9-F3xI2C6- Cys-Loop 165. CH19_2-G6xI2C6- Cys-Loop 166. CH19_2-H7xI2C6- Cys-Loop 167. CH19_5-B3xI2C6- Cys-Loop 168. CH19_5- E10xI2C6-Cys- Loop 169. CH19_6- G10xI2C6-Cys- Loop 170. CH19_4-H8xI2C6- Cys-Loop 171. CH19_2-E4xI2C6- Cys-Loop 172. CH19_6-B8xI2C6- Cys-Loop 173. CH19_0-B4xI2C6- Cys-Loop 174. CH19_9-F1xI2C6- Cys-Loop 175. CH19_4-A7xI2C6- Cys-Loop 176. CH19_6- E12xI2C6-Cys- Loop 177. CH19_6- C12xI2C6-Cys- Loop 178. CH19_6-A7xI2C6- Cys-Loop 179. CH19_6-G8xI2C6- Cys-Loop 180. CH19_6-F9xI2C6- Cys-Loop 181. CH19_0- C11xI2C6-Cys- Loop 182. CH19_8-F6xI2C6- Cys-Loop 183. CH19_0-G9xI2C6- Cys-Loop 184. CH19_1- E11xI2C6-Cys- Loop 185. CH19_0-F5xI2C6- Cys-Loop 186. CH19_1-E1xI2C6- Cys-Loop 187. CH19_1-E6xI2C6- Cys-Loop 188. CH19_2G6_302xI2C6- Cys-Loop 189. CH19_2G6_302_VKGxI2C6- LH-FcB- CH 190. CH19_0- E11xI2C6-LH-FcB- CH 191. CH19_5-G4xI2C6- LH-FcB-CH 192. CH19_8-H6xI2C6- LH-FcB-CH 193. CH19_2- C11xI2C6-LH-FcB- CH 194. CH19_2- A10xI2C6-LH-FcB- CH 195. CH19_1- D11xI2C6-LH-FcB- CH 196. CH19_9-F9xI2C6- LH-FcB-CH 197. CH19_1-H8xI2C6- LH-FcB-CH 198. CH19_1- B12xI2C6-LH-FcB- CH 199. CH19_0-C4xI2C6- LH-FcB-CH 200. CH19_3-F2xI2C6- LH-FcB-CH 201. CH19_3- B10xI2C6-LH-FcB- CH 202. CH19_0-G4xI2C6- LH-FcB-CH 203. CH19_0-H5xI2C6- LH-FcB-CH 204. CH19_0-B8xI2C6- LH-FcB-CH 205. CH19_2-D9xI2C6- LH-FcB-CH 206. CH19_8-H7xI2C6- LH-FcB-CH 207. CH19_9-C2xI2C6- LH-FcB-CH 208. CH19_3-D5xI2C6- LH-FcB-CH 209. CH19_1- G11xI2C6-LH-FcB- CH 210. CH19_1- H11xI2C6-LH-FcB- CH 211. CH19_9-F3xI2C6- LH-FcB-CH 212. CH19_2-G6xI2C6- LH-FcB-CH 213. CH19_2-H7xI2C6- LH-FcB-CH 214. CH19_5-B3xI2C6- LH-FcB-CH 215. CH19_5- E10xI2C6-LH-FcB- CH 216. CH19_6- G10xI2C6-LH-FcB- CH 217. CH19_4-H8xI2C6- LH-FcB-CH 218. CH19_2-E4xI2C6- LH-FcB-CH 219. CH19_6-B8xI2C6- LH-FcB-CH 220. CH19_0-B4xI2C6- LH-FcB-CH 221. CH19_9-F1xI2C6- LH-FcB-CH 222. CH19_4-A7xI2C6- LH-FcB-CH 223. CH19_6- E12xI2C6-LH-FcB- CH 224. CH19_6- C12xI2C6-LH-FcB- CH 225. CH19_6-A7xI2C6- LH-FcB-CH 226. CH19_6-G8xI2C6- LH-FcB-CH 227. CH19_6-F9xI2C6- LH-FcB-CH 228. CH19_0- C11xI2C6-LH-FcB- CH 229. CH19_8-F6xI2C6- LH-FcB-CH 230. CH19_0-G9xI2C6- LH-FcB-CH 231. CH19_1- E11xI2C6-LH-FcB- CH 232. CH19_0-F5xI2C6- LH-FcB-CH 233. CH19_1-E1xI2C6- LH-FcB-CH 234. CH19_1-E6xI2C6- LH-FcB-CH 235. CH19_2G6_302xI2C6- LH-FcB-CH 236. CH19_2G6_302_VKGxI2C6- LH-FcB- LH 237. CH19_0- E11xI2C6-LH-FcB- LH 238. CH19_5-G4xI2C6- LH-FcB-LH 239. CH19_8-H6xI2C6- LH-FcB-LH 240. CH19_2- C11xI2C6-LH-FcB- LH 241. CH19_2- A10xI2C6-LH-FcB- LH 242. CH19_1- D11xI2C6-LH-FcB- LH 243. CH19_9-F9xI2C6- LH-FcB-LH 244. CH19_1-H8xI2C6- LH-FcB-LH 245. CH19_1- B12xI2C6-LH-FcB- LH 246. CH19_0-C4xI2C6- LH-FcB-LH 247. CH19_3-F2xI2C6- LH-FcB-LH 248. CH19_3- B10xI2C6-LH-FcB- LH 249. CH19_0-G4xI2C6- LH-FcB-LH 250. CH19_0-H5xI2C6- LH-FcB-LH 251. CH19_0-B8xI2C6- LH-FcB-LH 252. CH19_2-D9xI2C6- LH-FcB-LH 253. CH19_8-H7xI2C6- LH-FcB-LH 254. CH19_9-C2xI2C6- LH-FcB-LH 255. CH19_3-D5xI2C6- LH-FcB-LH 256. CH19_1- G11xI2C6-LH-FcB- LH 257. CH19_1- H11xI2C6-LH-FcB- LH 258. CH19_9-F3xI2C6- LH-FcB-LH 259. CH19_2-G6xI2C6- LH-FcB-LH 260. CH19_2-H7xI2C6- LH-FcB-LH 261. CH19_5-B3xI2C6- LH-FcB-LH 262. CH19_5- E10xI2C6-LH-FcB- LH 263. CH19_6- G10xI2C6-LH-FcB- LH 264. CH19_4-H8xI2C6- LH-FcB-LH 265. CH19_2-E4xI2C6- LH-FcB-LH 266. CH19_6-B8xI2C6- LH-FcB-LH 267. CH19_0-B4xI2C6- LH-FcB-LH 268. CH19_9-F1xI2C6- LH-FcB-LH 269. CH19_4-A7xI2C6- LH-FcB-LH 270. CH19_6- E12xI2C6-LH-FcB- LH 271. CH19_6- C12xI2C6-LH-FcB- LH 272. CH19_6-A7xI2C6- LH-FcB-LH 273. CH19_6-G8xI2C6- LH-FcB-LH 274. CH19_6-F9xI2C6- LH-FcB-LH 275. CH19_0- C11xI2C6-LH-FcB- LH 276. CH19_8-F6xI2C6- LH-FcB-LH 277. CH19_0-G9xI2C6- LH-FcB-LH 278. CH19_1- E11xI2C6-LH-FcB- LH 279. CH19_0-F5xI2C6- LH-FcB-LH 280. CH19_1-E1xI2C6- LH-FcB-LH 281. CH19_1-E6xI2C6- LH-FcB-LH 282. CH19_2G6_302xI2C6- LH-FcB-LH 283. CH19_2G6_302_VKGxI2C6- LY-FcB- LH 284. CH19_0- E11xI2C6-LY-FcB- LH 285. CH19_5-G4xI2C6- LY-FcB-LH 286. CH198-H6xI2C6- LY-FcB-LH 287. CH19_2- C11xI2C6-LY-FcB- LH 288. CH19_2- A10xI2C6-LY-FcB- LH 289. CH19_1- D11xI2C6-LY-FcB- LH 290. CH19_9-F9xI2C6- LY-FcB-LH 291. CH19_1-H8xI2C6- LY-FcB-LH 292. CH19_1- B12xI2C6-LY-FcB- LH 293. CH19_0-C4xI2C6- LY-FcB-LH 294. CH19_3-F2xI2C6- LY-FcB-LH 295. CH19_3- B10xI2C6-LY-FcB- LH 296. CH19_0-G4xI2C6- LY-FcB-LH 297. CH19_0-H5xI2C6- LY-FcB-LH 298. CH19_0-B8xI2C6- LY-FcB-LH 299. CH19_2-D9xI2C6- LY-FcB-LH 300. CH19_8-H7xI2C6- LY-FcB-LH 301. CH19_9-C2xI2C6- LY-FcB-LH 302. CH19_3-D5xI2C6- LY-FcB-LH 303. CH19_1- G11xI2C6-LY-FcB- LH 304. CH19_1- H11xI2C6-LY-FcB- LH 305. CH19_9-F3xI2C6- LY-FcB-LH 306. CH19_2-G6xI2C6- LY-FcB-LH 307. CH19_2-H7xI2C6- LY-FcB-LH 308. CH19_5-B3xI2C6- LY-FcB-LH 309. CH19_5- E10xI2C6-LY-FcB- LH 310. CH19_6- G10xI2C6-LY-FcB- LH 311. CH19_4-H8xI2C6- LY-FcB-LH 312. CH19_2-E4xI2C6- LY-FcB-LH 313. CH19_6-B8xI2C6- LY-FcB-LH 314. CH19_0-B4xI2C6- LY-FcB-LH 315. CH19_9-F1xI2C6- LY-FcB-LH 316. CH19_4-A7xI2C6- LY-FcB-LH 317. CH19_6- E12xI2C6-LY-FcB- LH 318. CH19_6- C12xI2C6-LY-FcB- LH 319. CH19_6-A7xI2C6- LY-FcB-LH 320. CH19_6-G8xI2C6- LY-FcB-LH 321. CH19_6-F9xI2C6- LY-FcB-LH 322. CH19_0- C11xI2C6-LY-FcB- LH 323. CH19_8-F6xI2C6- LY-FcB-LH 324. CH19_0-G9xI2C6- LY-FcB-LH 325. CH19_1- E11xI2C6-LY-FcB- LH 326. CH19_0-F5xI2C6- LY-FcB-LH 327. CH19_1-E1xI2C6- LY-FcB-LH 328. CH19_1-E6xI2C6- LY-FcB-LH 329. CH19_2G6_302xI2C6- LY-FcB-LH 330. CH19_2G6_302_VKGxI2C6- LH-FcB- CH-156 331. CH19_0- E11xI2C6-LH-FcB- CH-156 332. CH19_5-G4xI2C6- LH-FcB-CH-156 333. CH19_8-H6xI2C6- LH-FcB-CH-156 334. CH19_2- C11xI2C6-LH-FcB- CH-156 335. CH19_2- A10xI2C6-LH-FcB- CH-156 336. CH19_1- D11xI2C6-LH-FcB- CH-156 337. CH19_9-F9xI2C6- LH-FcB-CH-156 338. CH19_1-H8xI2C6- LH-FcB-CH-156 339. CH19_1- B12xI2C6-LH-FcB- CH-156 340. CH19_0-C4xI2C6- LH-FcB-CH-156 341. CH19_3-F2xI2C6- LH-FcB-CH-156 342. CH19_3- B10xI2C6-LH-FcB- CH-156 343. CH19_0-G4xI2C6- LH-FcB-CH-156 344. CH19_0-H5xI2C6- LH-FcB-CH-156 345. CH19_0-B8xI2C6- LH-FcB-CH-156 346. CH19_2-D9xI2C6- LH-FcB-CH-156 347. CH19_8-H7xI2C6- LH-FcB-CH-156 348. CH19_9-C2xI2C6- LH-FcB-CH-156 349. CH19_3-D5xI2C6- LH-FcB-CH-156 350. CH19_1- G11xI2C6-LH-FcB- CH-156 351. CH19_1- H11xI2C6-LH-FcB- CH-156 352. CH19_9-F3xI2C6- LH-FcB-CH-156 353. CH19_2-G6xI2C6- LH-FcB-CH-156 354. CH19_2-H7xI2C6- LH-FcB-CH-156 355. CH19_5-B3xI2C6- LH-FcB-CH-156 356. CH19_5- E10xI2C6-LH-FcB- CH-156 357. CH19_6- G10xI2C6-LH-FcB- CH-156 358. CH19_4-H8xI2C6- LH-FcB-CH-156 359. CH19_2-E4xI2C6- LH-FcB-CH-156 360. CH19_6-B8xI2C6- LH-FcB-CH-156 361. CH19_0-B4xI2C6- LH-FcB-CH-156 362. CH19_9-F1xI2C6- LH-FcB-CH-156 363. CH19_4-A7xI2C6- LH-FcB-CH-156 364. CH19_6- E12xI2C6-LH-FcB- CH-156 365. CH19_6- C12xI2C6-LH-FcB- CH-156 366. CH19_6-A7xI2C6- LH-FcB-CH-156 367. CH19_6-G8xI2C6- LH-FcB-CH-156 368. CH19_6-F9xI2C6- LH-FcB-CH-156 369. CH19_0- C11xI2C6-LH-FcB- CH-156 370. CH19_8-F6xI2C6- LH-FcB-CH-156 371. CH19_0-G9xI2C6- LH-FcB-CH-156 372. CH19_1- E11xI2C6-LH-FcB- CH-156 373. CH19_0-F5xI2C6- LH-FcB-CH-156 374. CH19_1-E1xI2C6- LH-FcB-CH-156 375. CH19_1-E6xI2C6- LH-FcB-CH-156 376. CH19_2G6_302xI2C6- LH-FcB-CH- 156 377. CH19_2G6_302_VKGxI2C6- LH-FcB- LH-156 378. CH19_0- E11xI2C6-LH-FcB- LH-156 379. CH19_5-G4xI2C6- LH-FcB-LH-156 380. CH19_8-H6xI2C6- LH-FcB-LH-156 381. CH19_2- C11xI2C6-LH-FcB- LH-156 382. CH19_2- A10xI2C6-LH-FcB- LH-156 383. CH19_1- D11xI2C6-LH-FcB- LH-156 384. CH19_9-F9xI2C6- LH-FcB-LH-156 385. CH19_1-H8xI2C6- LH-FcB-LH-156 386. CH19_1- B12xI2C6-LH-FcB- LH-156 387. CH19_0-C4xI2C6- LH-FcB-LH-156 388. CH19_3-F2xI2C6- LH-FcB-LH-156 389. CH19_3- B10xI2C6-LH-FcB- LH-156 390. CH19_0-G4xI2C6- LH-FcB-LH-156 391. CH19_0-H5xI2C6- LH-FcB-LH-156 392. CH19_0-B8xI2C6- LH-FcB-LH-156 393. CH19_2-D9xI2C6- LH-FcB-LH-156 394. CH19_8-H7xI2C6- LH-FcB-LH-156 395. CH19_9-C2xI2C6- LH-FcB-LH-156 396. CH19_3-D5xI2C6- LH-FcB-LH-156 397. CH19_1- G11xI2C6-LH-FcB- LH-156 398. CH19_1- H11xI2C6-LH-FcB- LH-156 399. CH19_9-F3xI2C6- LH-FcB-LH-156 400. CH19_2-G6xI2C6- LH-FcB-LH-156 401. CH19_2-H7xI2C6- LH-FcB-LH-156 402. CH19_5-B3xI2C6- LH-FcB-LH-156 403. CH19_5- E10xI2C6-LH-FcB- LH-156 404. CH19_6- G10xI2C6-LH-FcB- LH-156 405. CH19_4-H8xI2C6- LH-FcB-LH-156 406. CH19_2-E4xI2C6- LH-FcB-LH-156 407. CH19_6-B8xI2C6- LH-FcB-LH-156 408. CH19_0-B4xI2C6- LH-FcB-LH-156 409. CH19_9-F1xI2C6- LH-FcB-LH-156 410. CH19_4-A7xI2C6- LH-FcB-LH-156 411. CH19_6- E12xI2C6-LH-FcB- LH-156 412. CH19_6- C12xI2C6-LH-FcB- LH-156 413. CH19_6-A7xI2C6- LH-FcB-LH-156 414. CH19_6-G8xI2C6- LH-FcB-LH-156 415. CH19_6-F9xI2C6- LH-FcB-LH-156 416. CH19_0- C11xI2C6-LH-FcB- LH-156 417. CH19_8-F6xI2C6- LH-FcB-LH-156 418. CH19_0-G9xI2C6- LH-FcB-LH-156 419. CH19_1- E11xI2C6-LH-FcB- LH-156 420. CH19_0-F5xI2C6- LH-FcB-LH-156 421. CH19_1-E1xI2C6- LH-FcB-LH-156 422. CH19_1-E6xI2C6- LH-FcB-LH-156 423. CH19_2G6_302xI2C6- LH-FcB-LH- 156 424. CH19_2G6_302_VKGxI2C6- LY-FcB- LH-156 425. CH19_0- E11xI2C6-LY-FcB- LH-156 426. CH19_5-G4xI2C6- LY-FcB-LH-156 427. CH19_8-H6xI2C6- LY-FcB-LH-156 428. CH19_2- C11xI2C6-LY-FcB- LH-156 429. CH19_2- A10xI2C6-LY-FcB- LH-156 430. CH19_1- D11xI2C6-LY-FcB- LH-156 431. CH19_9-F9xI2C6- LY-FcB-LH-156 432. CH19_1-H8xI2C6- LY-FcB-LH-156 433. CH19_1- B12xI2C6-LY-FcB- LH-156 434. CH19_0-C4xI2C6- LY-FcB-LH-156 435. CH19_3-F2xI2C6- LY-FcB-LH-156 436. CH19_3- B10xI2C6-LY-FcB- LH-156 437. CH19_0-G4xI2C6- LY-FcB-LH-156 438. CH19_0-H5xI2C6- LY-FcB-LH-156 439. CH19_0-B8xI2C6- LY-FcB-LH-156 440. CH19_2-D9xI2C6- LY-FcB-LH-156 441. CH19_8-H7xI2C6- LY-FcB-LH-156 442. CH19_9-C2xI2C6- LY-FcB-LH-156 443. CH19_3-D5xI2C6- LY-FcB-LH-156 444. CH19_1- G11xI2C6-LY-FcB- LH-156 445. CH19_1- H11xI2C6-LY-FcB- LH-156 446. CH19_9-F3xI2C6- LY-FcB-LH-156 447. CH19_2-G6xI2C6- LY-FcB-LH-156 448. CH19_2-H7xI2C6- LY-FcB-LH-156 449. CH19_5-B3xI2C6- LY-FcB-LH-156 450. CH19_5- E10xI2C6-LY-FcB- LH-156 451. CH19_6- G10xI2C6-LY-FcB- LH-156 452. CH19_4-H8xI2C6- LY-FcB-LH-156 453. CH19_2-E4xI2C6- LY-FcB-LH-156 454. CH19_6-B8xI2C6- LY-FcB-LH-156 455. CH19_0-B4xI2C6- LY-FcB-LH-156 456. CH19_9-F1xI2C6- LY-FcB-LH-156 457. CH19_4-A7xI2C6- LY-FcB-LH-156 458. CH19_6- E12xI2C6-LY-FcB- LH-156 459. CH19_6- C12xI2C6-LY-FcB- LH-156 460. CH19_6-A7xI2C6- LY-FcB-LH-156 461. CH19_6-G8xI2C6- LY-FcB-LH-156 462. CH19_6-F9xI2C6- LY-FcB-LH-156 463. CH19_0- C11xI2C6-LY-FcB- LH-156 464. CH19_8-F6xI2C6- LY-FcB-LH-156 465. CH19_0-G9xI2C6- LY-FcB-LH-156 466. CH19_1- E11xI2C6-LY-FcB- LH-156 467. CH19_0-F5xI2C6- LY-FcB-LH-156 468. CH19_1-E1xI2C6- LY-FcB-LH-156 469. CH19_1-E6xI2C6- LY-FcB-LH-156 470. CH19_2G6_302xI2C6- LY-FcB-LH- 156 471. CH19_2G6_302_VKGxI2C6- ALB8 472. CH19_0- E11xI2C6-ALB8 473. CH19_5-G4xI2C6- ALB8 474. CH19_8-H6xI2C6- ALB8 475. CH19_2- C11xI2C6-ALB8 476. CH19_2- A10xI2C6-ALB8 477. CH19_1- D11xI2C6-ALB8 478. CH19_9-F9xI2C6- ALB8 479. CH19_1-H8xI2C6- ALB8 480. CH19_1- B12xI2C6-ALB8 481. CH19_0-C4xI2C6- ALB8 482. CH19_3-F2xI2C6- ALB8 483. CH19_3- B10xI2C6-ALB8 484. CH19_0-G4xI2C6- ALB8 485. CH19_0-H5xI2C6- ALB8 486. CH19_0-B8xI2C6- ALB8 487. CH19_2-D9xI2C6- ALB8 488. CH19_8-H7xI2C6- ALB8 489. CH19_9-C2xI2C6- ALB8 490. CH19_3-D5xI2C6- ALB8 491. CH19_1- G11xI2C6-ALB8 492. CH19_1- H11xI2C6-ALB8 493. CH19_9-F3xI2C6- ALB8 494. CH19_2-G6xI2C6- ALB8 495. CH19_2-H7xI2C6- ALB8 496. CH19_5-B3xI2C6- ALB8 497. CH19_5- E10xI2C6-ALB8 498. CH19_6- G10xI2C6-ALB8 499. CH19_4-H8xI2C6- ALB8 500. CH19_2-E4xI2C6- ALB8 501. CH19_6-B8xI2C6- ALB8 502. CH19_0-B4xI2C6- ALB8 503. CH19_9-F1xI2C6- ALB8 504. CH19_4-A7xI2C6- ALB8 505. CH19_6- E12xI2C6-ALB8 506. CH19_6- C12xI2C6-ALB8 507. CH19_6-A7xI2C6- ALB8 508. CH19_6-G8xI2C6- ALB8 509. CH19_6-F9xI2C6- ALB8 510. CH19_0- C11xI2C6-ALB8 511. CH19_8-F6xI2C6- ALB8 512. CH19_0-G9xI2C6- ALB8 513. CH19_1- E11xI2C6-ALB8 514. CH19_0-F5xI2C6- ALB8 515. CH19_1-E1xI2C6- ALB8 516. CH19_1-E6xI2C6- ALB8 517. CH19_2G6_302xI2C6- ALB8 518. CH19_2G6_302_VKGxI2C6- ALB23 519. CH19_0- E11xI2C6-ALB23 520. CH19_5-G4xI2C6- ALB23 521. CH19_8-H6xI2C6- ALB23 522. CH19_2- C11xI2C6-ALB23 523. CH19_2- A10xI2C6-ALB23 524. CH19_1- D11xI2C6-ALB23 525. CH19_9-F9xI2C6- ALB23 526. CH19_1-H8xI2C6- ALB23 527. CH19_1- B12xI2C6-ALB23 528. CH19_0-C4xI2C6- ALB23 529. CH19_3-F2xI2C6- ALB23 530. CH19_3- B10xI2C6-ALB23 531. CH19_0-G4xI2C6- ALB23 532. CH19_0-H5xI2C6- ALB23 533. CH19_0-B8xI2C6- ALB23 534. CH19_2-D9xI2C6- ALB23 535. CH19_8-H7xI2C6- ALB23 536. CH19_9-C2xI2C6- ALB23 537. CH19_3-D5xI2C6- ALB23 538. CH19_1- G11xI2C6-ALB23 539. CH19_1- H11xI2C6-ALB23 540. CH19_9-F3xI2C6- ALB23 541. CH19_2-G6xI2C6- ALB23 542. CH19_2-H7xI2C6- ALB23 543. CH19_5-B3xI2C6- ALB23 544. CH19_5- E10xI2C6-ALB23 545. CH19_6- G10xI2C6-ALB23 546. CH19_4-H8xI2C6- ALB23 547. CH19_2-E4xI2C6- ALB23 548. CH19_6-B8xI2C6- ALB23 549. CH19_0-B4xI2C6- ALB23 550. CH19_9-F1xI2C6- ALB23 551. CH19_4-A7xI2C6- ALB23 552. CH19_6- E12xI2C6-ALB23 553. CH19_6- C12xI2C6-ALB23 554. CH19_6-A7xI2C6- ALB23 555. CH19_6-G8xI2C6- ALB23 556. CH19_6-F9xI2C6- ALB23 557. CH19_0- C11xI2C6-ALB23 558. CH19_8-F6xI2C6- ALB23 559. CH19_0-G9xI2C6- ALB23 560. CH19_1- E11xI2C6-ALB23 561. CH19_0-F5xI2C6- ALB23 562. CH19_1-E1xI2C6- ALB23 563. CH19_1-E6xI2C6- ALB23 564. CH19_2G6_302xI2C6- ALB23 565. CH19_2G6_302_VKGxI2C6- HALBwD 566. CH19_0- E11xI2C6- HALBwD 567. CH19_5-G4xI2C6- HALBwD 568. CH19_8-H6xI2C6- HALBwD 569. CH19_2- C11xI2C6- HALBwD 570. CH19_2- A10xI2C6- HALBwD 571. CH19_1- D11xI2C6- HALBwD 572. CH19_9-F9xI2C6- HALBwD 573. CH19_1-H8xI2C6- HALBwD 574. CH19_1- B12xI2C6- HALBwD 575. CH19_0-C4xI2C6- HALBwD 576. CH19_3-F2xI2C6- HALBwD 577. CH19_3- B10xI2C6- HALBwD 578. CH19_0-G4xI2C6- HALBwD 579. CH19_0-H5xI2C6- HALBwD 580. CH19_0-B8xI2C6- HALBwD 581. CH19_2-D9xI2C6- HALBwD 582. CH19_8-H7xI2C6- HALBwD 583. CH19_9-C2xI2C6- HALBwD 584. CH19_3-D5xI2C6- HALBwD 585. CH19_1- G11xI2C6- HALBwD 586. CH19_1- H11xI2C6- HALBwD 587. CH19_9-F3xI2C6- HALBwD 588. CH19_2-G6xI2C6- HALBwD 589. CH19_2-H7xI2C6- HALBwD 590. CH19_5-B3xI2C6- HALBwD 591. CH19_5- E10xI2C6- HALBwD 592. CH19_6- G10xI2C6- HALBwD 593. CH19_4-H8xI2C6- HALBwD 594. CH19_2-E4xI2C6- HALBwD 595. CH19_6-B8xI2C6- HALBwD 596. CH19_0-B4xI2C6- HALBwD 597. CH19_9-F1xI2C6- HALBwD 598. CH19_4-A7xI2C6- HALBwD 599. CH19_6- E12xI2C6- HALBwD 600. CH19_6- C12xI2C6- HALBwD 601. CH19_6-A7xI2C6- HALBwD 602. CH19_6-G8xI2C6- HALBwD 603. CH19_6-F9xI2C6- HALBwD 604. CH19_0- C11xI2C6- HALBwD 605. CH19_8-F6xI2C6- HALBwD 606. CH19_0-G9xI2C6- HALBwD 607. CH19_1- E11xI2C6- HALBwD 608. CH19_0-F5xI2C6- HALBwD 609. CH19_1-E1xI2C6- HALBwD 610. CH19_1-E6xI2C6- HALBwD 611. CH19_2G6_302xI2C6- HALBwD 612. CH19_2G6_302_VKGxI2C6- HALB 613. CH19_0- E11xI2C6-HALB 614. CH19_5-G4xI2C6- HALB 615. CH19_8-H6xI2C6- HALB 616. CH19_2- C11xI2C6-HALB 617. CH19_2- A10xI2C6-HALB 618. CH19_1- D11xI2C6-HALB 619. CH19_9-F9xI2C6- HALB 620. CH19_1-H8xI2C6- HALB 621. CH19_1- B12xI2C6-HALB 622. CH19_0-C4xI2C6- HALB 623. CH19_3-F2xI2C6- HALB 624. CH19_3- B10xI2C6-HALB 625. CH19_0-G4xI2C6- HALB 626. CH19_0-H5xI2C6- HALB 627. CH19_0-B8xI2C6- HALB 628. CH19_2-D9xI2C6- HALB 629. CH19_8-H7xI2C6- HALB 630. CH19_9-C2xI2C6- HALB 631. CH19_3-D5xI2C6- HALB 632. CH19_1- G11xI2C6-HALB 633. CH19_1- H11xI2C6-HALB 634. CH19_9-F3xI2C6- HALB 635. CH19_2-G6xI2C6- HALB 636. CH19_2-H7xI2C6- HALB 637. CH19_5-B3xI2C6- HALB 638. CH19_5- E10xI2C6-HALB 639. CH19_6- G10xI2C6-HALB 640. CH19_4-H8xI2C6- HALB 641. CH19_2-E4xI2C6- HALB 642. CH19_6-B8xI2C6- HALB 643. CH19_0-B4xI2C6- HALB 644. CH19_9-F1xI2C6- HALB 645. CH19_4-A7xI2C6- HALB 646. CH19_6- E12xI2C6-HALB 647. CH19_6- C12xI2C6-HALB 648. CH19_6-A7xI2C6- HALB 649. CH19_6-G8xI2C6- HALB 650. CH19_6-F9xI2C6- HALB 651. CH19_0- C11xI2C6-HALB 652. CH19_8-F6xI2C6- HALB 653. CH19_0-G9xI2C6- HALB 654. CH19_1- E11xI2C6-HALB 655. CH19_0-F5xI2C6- HALB 656. CH19_1-E1xI2C6- HALB 657. CH19_1-E6xI2C6- HALB 658. CH19_2G6_302xI2C6- HALB 659. CH19_2G6_302_VKGxI2C6- HALB7 660. CH19_0- E11xI2C6-HALB7 661. CH19_5-G4xI2C6- HALB7 662. CH19_8-H6xI2C6- HALB7 663. CH19_2- C11xI2C6-HALB7 664. CH19_2- A10xI2C6-HALB7 665. CH19_1- D11xI2C6-HALB7 666. CH19_9-F9xI2C6- HALB7 667. CH19_1-H8xI2C6- HALB7 668. CH19_1- B12xI2C6-HALB7 669. CH19_0-C4xI2C6- HALB7 670. CH19_3-F2xI2C6- HALB7 671. CH19_3- B10xI2C6-HALB7 672. CH19_0-G4xI2C6- HALB7 673. CH19_0-H5xI2C6- HALB7 674. CH19_0-B8xI2C6- HALB7 675. CH19_2-D9xI2C6- HALB7 676. CH19_8-H7xI2C6- HALB7 677. CH19_9-C2xI2C6- HALB7 678. CH19_3-D5xI2C6- HALB7 679. CH19_1- G11xI2C6-HALB7 680. CH19_1- H11xI2C6-HALB7 681. CH19_9-F3xI2C6- HALB7 682. CH19_2-G6xI2C6- HALB7 683. CH19_2-H7xI2C6- HALB7 684. CH19_5-B3xI2C6- HALB7 685. CH19_5- E10xI2C6-HALB7 686. CH19_6- G10xI2C6-HALB7 687. CH19_4-H8xI2C6- HALB7 688. CH19_2-E4xI2C6- HALB7 689. CH19_6-B8xI2C6- HALB7 690. CH19_0-B4xI2C6- HALB7 691. CH19_9-F1xI2C6- HALB7 692. CH19_4-A7xI2C6- HALB7 693. CH19_6- E12xI2C6-HALB7 694. CH19_6- C12xI2C6-HALB7 695. CH19_6-A7xI2C6- HALB7 696. CH19_6-G8xI2C6- HALB7 697. CH19_6-F9xI2C6- HALB7 698. CH19_0- C11xI2C6-HALB7 699. CH19_8-F6xI2C6- HALB7 700. CH19_0-G9xI2C6- HALB7 701. CH19_1- E11xI2C6-HALB7 702. CH19_0-F5xI2C6- HALB7 703. CH19_1-E1xI2C6- HALB7 704. CH19_1-E6xI2C6- HALB7 705. CH19_2G6_302xI2C6- HALB7 706. CH19_2G6_302_VKGxI2C6- HALB098 707. CH19_0- E11xI2C6- HALB098 708. CH19_5-G4xI2C6- HALB098 709. CH19_8-H6xI2C6- HALB098 710. CH19_2- C11xI2C6- HALB098 711. CH19_2- A10xI2C6- HALB098 712. CH19_1- D11xI2C6- HALB098 713. CH19_9-F9xI2C6- HALB098 714. CH19_1-H8xI2C6- HALB098 715. CH19_1- B12xI2C6- HALB098 716. CH19_0-C4xI2C6- HALB098 717. CH19_3-F2xI2C6- HALB098 718. CH19_3- B10xI2C6- HALB098 719. CH19_0-G4xI2C6- HALB098 720. CH19_0-H5xI2C6- HALB098 721. CH19_0-B8xI2C6- HALB098 722. CH19_2-D9xI2C6- HALB098 723. CH19_8-H7xI2C6- HALB098 724. CH19_9-C2xI2C6- HALB098 725. CH19_3-D5xI2C6- HALB098 726. CH19_1- G11xI2C6- HALB098 727. CH19_1- H11xI2C6- HALB098 728. CH19_9-F3xI2C6- HALB098 729. CH19_2-G6xI2C6- HALB098 730. CH19_2-H7xI2C6- HALB098 731. CH19_5-B3xI2C6- HALB098 732. CH19_5- E10xI2C6- HALB098 733. CH19_6- G10xI2C6- HALB098 734. CH19_4-H8xI2C6- HALB098 735. CH19_2-E4xI2C6- HALB098 736. CH19_6-B8xI2C6- HALB098 737. CH19_0-B4xI2C6- HALB098 738. CH19_9-F1xI2C6- HALB098 739. CH19_4-A7xI2C6- HALB098 740. CH19_6- E12xI2C6- HALB098 741. CH19_6- C12xI2C6- HALB098 742. CH19_6-A7xI2C6- HALB098 743. CH19_6-G8xI2C6- HALB098 744. CH19_6-F9xI2C6- HALB098 745. CH19_0- C11xI2C6- HALB098 746. CH19_8-F6xI2C6- HALB098 747. CH19_0-G9xI2C6- HALB098 748. CH19_1- E11xI2C6- HALB098 749. CH19_0-F5xI2C6- HALB098 750. CH19_1-E1xI2C6- HALB098 751. CH19_1-E6xI2C6- HALB098 752. CH19_2G6_302xI2C6- HALB098 753. CH19_2G6_302_VKGxI2C6- HALB114 754. CH19_0- E11xI2C6- HALB114 755. CH19_5-G4xI2C6- HALB114 756. CH19_8-H6xI2C6- HALB114 757. CH19_2- C11xI2C6- HALB114 758. CH19_2- A10xI2C6- HALB114 759. CH19_1- D11xI2C6- HALB114 760. CH19_9-F9xI2C6- HALB114 761. CH19_1-H8xI2C6- HALB114 762. CH19_1- B12xI2C6- HALB114 763. CH19_0-C4xI2C6- HALB114 764. CH19_3-F2xI2C6- HALB114 765. CH19_3- B10xI2C6- HALB114 766. CH19_0-G4xI2C6- HALB114 767. CH19_0-H5xI2C6- HALB114 768. CH19_0-B8xI2C6- HALB114 769. CH19_2-D9xI2C6- HALB114 770. CH19_8-H7xI2C6- HALB114 771. CH19_9-C2xI2C6- HALB114 772. CH19_3-D5xI2C6- HALB114 773. CH19_1- G11xI2C6- HALB114 774. CH19_1- H11xI2C6- HALB114 775. CH19_9-F3xI2C6- HALB114 776. CH19_2-G6xI2C6- HALB114 777. CH19_2-H7xI2C6- HALB114 778. CH19_5-B3xI2C6- HALB114 779. CH19_5- E10xI2C6- HALB114 780. CH19_6- G10xI2C6- HALB114 781. CH19_4-H8xI2C6- HALB114 782. CH19_2-E4xI2C6- HALB114 783. CH19_6-B8xI2C6- HALB114 784. CH19_0-B4xI2C6- HALB114 785. CH19_9-F1xI2C6- HALB114 786. CH19_4-A7xI2C6- HALB114 787. CH19_6- E12xI2C6- HALB114 788. CH19_6- C12xI2C6- HALB114 789. CH19_6-A7xI2C6- HALB114 790. CH19_6-G8xI2C6- HALB114 791. CH19_6-F9xI2C6- HALB114 792. CH19_0- C11xI2C6- HALB114 793. CH19_8-F6xI2C6- HALB114 794. CH19_0-G9xI2C6- HALB114 795. CH19_1- E11xI2C6- HALB114 796. CH19_0-F5xI2C6- HALB114 797. CH19_1-E1xI2C6- HALB114 798. CH19_1-E6xI2C6- HALB114 799. CH19_2G6_302xI2C6- HALB114 800. CH19_2G6_302_VKGxI2C6- HALB254 801. CH19_0- E11xI2C6- HALB254 802. CH19_5-G4xI2C6- HALB254 803. CH19_8-H6xI2C6- HALB254 804. CH19_2- C11xI2C6- HALB254 805. CH19_2- A10xI2C6- HALB254 806. CH19_1- D11xI2C6- HALB254 807. CH19_9-F9xI2C6- HALB254 808. CH19_1-H8xI2C6- HALB254 809. CH19_1- B12xI2C6- HALB254 810. CH19_0-C4xI2C6- HALB254 811. CH19_3-F2xI2C6- HALB254 812. CH19_3- B10xI2C6- HALB254 813. CH19_0-G4xI2C6- HALB254 814. CH19_0-H5xI2C6- HALB254 815. CH19_0-B8xI2C6- HALB254 816. CH19_2-D9xI2C6- HALB254 817. CH19_8-H7xI2C6- HALB254 818. CH19_9-C2xI2C6- HALB254 819. CH19_3-D5xI2C6- HALB254 820. CH19_1- G11xI2C6- HALB254 821. CH19_1- H11xI2C6- HALB254 822. CH19_9-F3xI2C6- HALB254 823. CH19_2-G6xI2C6- HALB254 824. CH19_2-H7xI2C6- HALB254 825. CH19_5-B3xI2C6- HALB254 826. CH19_5- E10xI2C6- HALB254 827. CH19_6- G10xI2C6- HALB254 828. CH19_4-H8xI2C6- HALB254 829. CH19_2-E4xI2C6- HALB254 830. CH19_6-B8xI2C6- HALB254 831. CH19_0-B4xI2C6- HALB254 832. CH19_9-F1xI2C6- HALB254 833. CH19_4-A7xI2C6- HALB254 834. CH19_6- E12xI2C6- HALB254 835. CH19_6- C12xI2C6- HALB254 836. CH19_6-A7xI2C6- HALB254 837. CH19_6-G8xI2C6- HALB254 838. CH19_6-F9xI2C6- HALB254 839. CH19_0- C11xI2C6- HALB254 840. CH19_8-F6xI2C6- HALB254 841. CH19_0-G9xI2C6- HALB254 842. CH19_1- E11xI2C6- HALB254 843. CH19_0-F5xI2C6- HALB254 844. CH19_1-E1xI2C6- HALB254 845. CH19_1-E6xI2C6- HALB254 846. CH19_2G6_302xI2C6- HALB254 847. CH19_2G6_302_VKGxI2C6- CH-FcB- LH 848. CH19_0- E11xI2C6-CH-FcB- LH 849. CH19_5-G4xI2C6- CH-FcB-LH 850. CH19_8-H6xI2C6- CH-FcB-LH 851. CH19_2- C11xI2C6-CH-FcB- LH 852. CH19_2- A10xI2C6-CH-FcB- LH 853. CH19_1- D11xI2C6-CH-FcB- LH 854. CH19_9-F9xI2C6- CH-FcB-LH 855. CH19_1-H8xI2C6- CH-FcB-LH 856. CH19_1- B12xI2C6-CH-FcB- LH 857. CH19_0-C4xI2C6- CH-FcB-LH 858. CH19_3-F2xI2C6- CH-FcB-LH 859. CH19_3- B10xI2C6-CH-FcB- LH 860. CH19_0-G4xI2C6- CH-FcB-LH 861. CH19_0-H5xI2C6- CH-FcB-LH 862. CH19_0-B8xI2C6- CH-FcB-LH 863. CH19_2-D9xI2C6- CH-FcB-LH 864. CH19_8-H7xI2C6- CH-FcB-LH 865. CH19_9-C2xI2C6- CH-FcB-LH 866. CH19_3-D5xI2C6- CH-FcB-LH 867. CH19_1- G11xI2C6-CH-FcB- LH 868. CH19_1- H11xI2C6-CH-FcB- LH 869. CH19_9-F3xI2C6- CH-FcB-LH 870. CH19_2-G6xI2C6- CH-FcB-LH 871. CH19_2-H7xI2C6- CH-FcB-LH 872. CH19_5-B3xI2C6- CH-FcB-LH 873. CH19_5- E10xI2C6-CH-FcB- LH 874. CH19_6- G10xI2C6-CH-FcB- LH 875. CH19_4-H8xI2C6- CH-FcB-LH 876. CH19_2-E4xI2C6- CH-FcB-LH 877. CH19_6-B8xI2C6- CH-FcB-LH 878. CH19_0-B4xI2C6- CH-FcB-LH 879. CH19_9-F1xI2C6- CH-FcB-LH 880. CH19_4-A7xI2C6- CH-FcB-LH 881. CH19_6- E12xI2C6-CH-FcB- LH 882. CH19_6- C12xI2C6-CH-FcB- LH 883. CH19_6-A7xI2C6- CH-FcB-LH 884. CH19_6-G8xI2C6- CH-FcB-LH 885. CH19_6-F9xI2C6- CH-FcB-LH 886. CH19_0- C11xI2C6-CH-FcB- LH 887. CH19_8-F6xI2C6- CH-FcB-LH 888. CH19_0-G9xI2C6- CH-FcB-LH 889. CH19_1- E11xI2C6-CH-FcB- LH 890. CH19_0-F5xI2C6- CH-FcB-LH 891. CH19_1-E1xI2C6- CH-FcB-LH 892. CH19_1-E6xI2C6- CH-FcB-LH 893. CH19_2G6_302xI2C6- CH-FcB-LH 894. CH19_2G6_302_VKGxI2C6- CH-FcB- LY 895. CH19_0- E11xI2C6-CH-FcB- LY 896. CH19_5-G4xI2C6- CH-FcB-LY 897. CH19_8-H6xI2C6- CH-FcB-LY 898. CH19_2- C11xI2C6-CH-FcB- LY 899. CH19_2- A10xI2C6-CH-FcB- LY 900. CH19_1- D11xI2C6-CH-FcB- LY 901. CH19_9-F9xI2C6- CH-FcB-LY 902. CH19_1-H8xI2C6- CH-FcB-LY 903. CH19_1- B12xI2C6-CH-FcB- LY 904. CH19_0-C4xI2C6- CH-FcB-LY 905. CH19_3-F2xI2C6- CH-FcB-LY 906. CH19_3- B10xI2C6-CH-FcB- LY 907. CH19_0-G4xI2C6- CH-FcB-LY 908. CH19_0-H5xI2C6- CH-FcB-LY 909. CH19_0-B8xI2C6- CH-FcB-LY 910. CH19_2-D9xI2C6- CH-FcB-LY 911. CH19_8-H7xI2C6- CH-FcB-LY 912. CH19_9-C2xI2C6- CH-FcB-LY 913. CH19_3-D5xI2C6- CH-FcB-LY 914. CH19_1- G11xI2C6-CH-FcB- LY 915. CH19_1- H11xI2C6-CH-FcB- LY 916. CH19_9-F3xI2C6- CH-FcB-LY 917. CH19_2-G6xI2C6- CH-FcB-LY 918. CH19_2-H7xI2C6- CH-FcB-LY 919. CH19_5-B3xI2C6- CH-FcB-LY 920. CH19_5- E10xI2C6-CH-FcB- LY 921. CH19_6- G10xI2C6-CH-FcB- LY 922. CH19_4-H8xI2C6- CH-FcB-LY 923. CH19_2-E4xI2C6- CH-FcB-LY 924. CH19_6-B8xI2C6- CH-FcB-LY 925. CH19_0-B4xI2C6- CH-FcB-LY 926. CH19_9-F1xI2C6- CH-FcB-LY 927. CH19_4-A7xI2C6- CH-FcB-LY 928. CH19_6- E12xI2C6-CH-FcB- LY 929. CH19_6- C12xI2C6-CH-FcB- LY 930. CH19_6-A7xI2C6- CH-FcB-LY 931. CH19_6-G8xI2C6- CH-FcB-LY 932. CH19_6-F9xI2C6- CH-FcB-LY 933. CH19_0- C11xI2C6-CH-FcB- LY 934. CH19_8-F6xI2C6- CH-FcB-LY 935. CH19_0-G9xI2C6- CH-FcB-LY 936. CH19_1- E11xI2C6-CH-FcB- LY 937. CH19_0-F5xI2C6- CH-FcB-LY 938. CH19_1-E1xI2C6- CH-FcB-LY 939. CH19_1-E6xI2C6- CH-FcB-LY 940. CH19_2G6_302xI2C6- CH-FcB-LY 941. CH19_2G6_302_VKGxI2C6- HALB253 942. CH19_0- E11xI2C6- HALB253 943. CH19_5-G4xI2C6- HALB253 944. CH19_8-H6xI2C6- HALB253 945. CH19_2- C11xI2C6- HALB253 946. CH19_2- A10xI2C6- HALB253 947. CH19_1- D11xI2C6- HALB253 948. CH19_9-F9xI2C6- HALB253 949. CH19_1-H8xI2C6- HALB253 950. CH19_1- B12xI2C6- HALB253 951. CH19_0-C4xI2C6- HALB253 952. CH19_3-F2xI2C6- HALB253 953. CH19_3- B10xI2C6- HALB253 954. CH19_0-G4xI2C6- HALB253 955. CH19_0-H5xI2C6- HALB253 956. CH19_0-B8xI2C6- HALB253 957. CH19_2-D9xI2C6- HALB253 958. CH19_8-H7xI2C6- HALB253 959. CH19_9-C2xI2C6- HALB253 960. CH19_3-D5xI2C6- HALB253 961. CH19_1- G11xI2C6- HALB253 962. CH19_1- H11xI2C6- HALB253 963. CH19_9-F3xI2C6- HALB253 964. CH19_2-G6xI2C6- HALB253 965. CH19_2-H7xI2C6- HALB253 966. CH19_5-B3xI2C6- HALB253 967. CH19_5- E10xI2C6- HALB253 968. CH19_6- G10xI2C6- HALB253 969. CH19_4-H8xI2C6- HALB253 970. CH19_2-E4xI2C6- HALB253 971. CH19_6-B8xI2C6- HALB253 972. CH19_0-B4xI2C6- HALB253 973. CH19_9-F1xI2C6- HALB253 974. CH19_4-A7xI2C6- HALB253 975. CH19_6- E12xI2C6- HALB253 976. CH19_6- C12xI2C6- HALB253 977. CH19_6-A7xI2C6- HALB253 978. CH19_6-G8xI2C6- HALB253 979. CH19_6-F9xI2C6- HALB253 980. CH19_0- C11xI2C6- HALB253 981. CH19_8-F6xI2C6- HALB253 982. CH19_0-G9xI2C6- HALB253 983. CH19_1- E11xI2C6- HALB253 984. CH19_0-F5xI2C6- HALB253 985. CH19_1-E1xI2C6- HALB253 986. CH19_1-E6xI2C6- HALB253 987. CH19_2G6_302xI2C6- HALB253 988. CH19_2G6_302_VKGxI2C6- HALB131 989. CH19_0- E11xI2C6- HALB131 990. CH19_5-G4xI2C6- HALB131 991. CH19_8-H6xI2C6- HALB131 992. CH19_2- C11xI2C6- HALB131 993. CH19_2- A10xI2C6- HALB131 994. CH19_1- D11xI2C6- HALB131 995. CH19_9-F9xI2C6- HALB131 996. CH19_1-H8xI2C6- HALB131 997. CH19_1- B12xI2C6- HALB131 998. CH19_0-C4xI2C6- HALB131 999. CH19_3-F2xI2C6- HALB131 1000. CH19_3- B10xI2C6- HALB131 1001. CH19_0-G4xI2C6- HALB131 1002. CH19_0-H5xI2C6- HALB131 1003. CH19_0-B8xI2C6- HALB131 1004. CH19_2-D9xI2C6- HALB131 1005. CH19_8-H7xI2C6- HALB131 1006. CH19_9-C2xI2C6- HALB131 1007. CH19_3-D5xI2C6- HALB131 1008. CH19_1- G11xI2C6- HALB131 1009. CH19_1- H11xI2C6- HALB131 1010. CH19_9-F3xI2C6- HALB131 1011. CH19_2-G6xI2C6- HALB131 1012. CH19_2-H7xI2C6- HALB131 1013. CH19_5-B3xI2C6- HALB131 1014. CH19_5- E10xI2C6- HALB131 1015. CH19_6- G10xI2C6- HALB131 1016. CH19_4-H8xI2C6- HALB131 1017. CH19_2-E4xI2C6- HALB131 1018. CH19_6-B8xI2C6- HALB131 1019. CH19_0-B4xI2C6- HALB131 1020. CH19_9-F1xI2C6- HALB131 1021. CH19_4-A7xI2C6- HALB131 1022. CH19_6- E12xI2C6- HALB131 1023. CH19_6- C12xI2C6- HALB131 1024. CH19_6-A7xI2C6- HALB131 1025. CH19_6-G8xI2C6- HALB131 1026. CH19_6-F9xI2C6- HALB131 1027. CH19_0- C11xI2C6- HALB131 1028. CH19_8-F6xI2C6- HALB131 1029. CH19_0-G9xI2C6- HALB131 1030. CH19_1- E11xI2C6- HALB131 1031. CH19_0-F5xI2C6- HALB131 1032. CH19_1-E1xI2C6- HALB131 1033. CH19_1-E6xI2C6- HALB131 1034. CH19_2G6_302xI2C6- HALB131 1035. CH19_2G6_302_VKGxI2C6- HALB135 1036. CH19_0- E11xI2C6- HALB135 1037. CH19_5-G4xI2C6- HALB135 1038. CH19_8-H6xI2C6- HALB135 1039. CH19_2- C11xI2C6- HALB135 1040. CH19_2- A10xI2C6- HALB135 1041. CH19_1- D11xI2C6- HALB135 1042. CH19_9-F9xI2C6- HALB135 1043. CH19_1-H8xI2C6- HALB135 1044. CH19_1- B12xI2C6- HALB135 1045. CH19_0-C4xI2C6- HALB135 1046. CH19_3-F2xI2C6- HALB135 1047. CH19_3- B10xI2C6- HALB135 1048. CH19_0-G4xI2C6- HALB135 1049. CH19_0-H5xI2C6- HALB135 1050. CH19_0-B8xI2C6- HALB135 1051. CH19_2-D9xI2C6- HALB135 1052. CH19_8-H7xI2C6- HALB135 1053. CH19_9-C2xI2C6- HALB135 1054. CH19_3-D5xI2C6- HALB135 1055. CH19_1- G11xI2C6- HALB135 1056. CH19_1- H11xI2C6- HALB135 1057. CH19_9-F3xI2C6- HALB135 1058. CH19_2-G6xI2C6- HALB135 1059. CH19_2-H7xI2C6- HALB135 1060. CH19_5-B3xI2C6- HALB135 1061. CH19_5- E10xI2C6- HALB135 1062. CH19_6- G10xI2C6- HALB135 1063. CH19_4-H8xI2C6- HALB135 1064. CH19_2-E4xI2C6- HALB135 1065. CH19_6-B8xI2C6- HALB135 1066. CH19_0-B4xI2C6- HALB135 1067. CH19_9-F1xI2C6- HALB135 1068. CH19_4-A7xI2C6- HALB135 1069. CH19_6- E12xI2C6- HALB135 1070. CH19_6- C12xI2C6- HALB135 1071. CH19_6-A7xI2C6- HALB135 1072. CH19_6-G8xI2C6- HALB135 1073. CH19_6-F9xI2C6- HALB135 1074. CH19_0- C11xI2C6- HALB135 1075. CH19_8-F6xI2C6- HALB135 1076. CH19_0-G9xI2C6- HALB135 1077. CH19_1- E11xI2C6- HALB135 1078. CH19_0-F5xI2C6- HALB135 1079. CH19_1-E1xI2C6- HALB135 1080. CH19_1-E6xI2C6- HALB135 1081. CH19_2G6_302xI2C6- HALB135 1082. CH19_2G6_302_VKGxI2C6- HALB133 1083. CH19_0- E11xI2C6- HALB133 1084. CH19_5-G4xI2C6- HALB133 1085. CH19_8-H6xI2C6- HALB133 1086. CH19_2- C11xI2C6- HALB133 1087. CH19_2- A10xI2C6- HALB133 1088. CH19_1- D11xI2C6- HALB133 1089. CH19_9-F9xI2C6- HALB133 1090. CH19_1-H8xI2C6- HALB133 1091. CH19_1- B12xI2C6- HALB133 1092. CH19_0-C4xI2C6- HALB133 1093. CH19_3-F2xI2C6- HALB133 1094. CH19_3- B10xI2C6- HALB133 1095. CH19_0-G4xI2C6- HALB133 1096. CH19_0-H5xI2C6- HALB133 1097. CH19_0-B8xI2C6- HALB133 1098. CH19_2-D9xI2C6- HALB133 1099. CH19_8-H7xI2C6- HALB133 1100. CH19_9-C2xI2C6- HALB133 1101. CH19_3-D5xI2C6- HALB133 1102. CH19_1- G11xI2C6- HALB133 1103. CH19_1- H11xI2C6- HALB133 1104. CH19_9-F3xI2C6- HALB133 1105. CH19_2-G6xI2C6- HALB133 1106. CH19_2-H7xI2C6- HALB133 1107. CH19_5-B3xI2C6- HALB133 1108. CH19_5- E10xI2C6- HALB133 1109. CH19_6- G10xI2C6- HALB133 1110. CH19_4-H8xI2C6- HALB133 1111. CH19_2-E4xI2C6- HALB133 1112. CH19_6-B8xI2C6- HALB133 1113. CH19_0-B4xI2C6- HALB133 1114. CH19_9-F1xI2C6- HALB133 1115. CH19_4-A7xI2C6- HALB133 1116. CH19_6- E12xI2C6- HALB133 1117. CH19_6- C12xI2C6- HALB133 1118. CH19_6-A7xI2C6- HALB133 1119. CH19_6-G8xI2C6- HALB133 1120. CH19_6-F9xI2C6- HALB133 1121. CH19_0- C11xI2C6- HALB133 1122. CH19_8-F6xI2C6- HALB133 1123. CH19_0-G9xI2C6- HALB133 1124. CH19_1- E11xI2C6- HALB133 1125. CH19_0-F5xI2C6- HALB133 1126. CH19_1-E1xI2C6- HALB133 1127. CH19_1-E6xI2C6- HALB133 1128. CH19_2G6_302xI2C6- HALB133 1129. CH19_2G6_302_VKGxI2C6- CH-FcB- LH-156 1130. CH19_0- E11xI2C6-CH-FcB- LH-156 1131. CH19_5-G4xI2C6- CH-FcB-LH-156 1132. CH19_8-H6xI2C6- CH-FcB-LH-156 1133. CH19_2- C11xI2C6-CH-FcB- LH-156 1134. CH19_2- A10xI2C6-CH-FcB- LH-156 1135. CH19_1- D11xI2C6-CH-FcB- LH-156 1136. CH19_9-F9xI2C6- CH-FcB-LH-156 1137. CH19_1-H8xI2C6- CH-FcB-LH-156 1138. CH19_1- B12xI2C6-CH-FcB- LH-156 1139. CH19_0-C4xI2C6- CH-FcB-LH-156 1140. CH19_3-F2xI2C6- CH-FcB-LH-156 1141. CH19_3- B10xI2C6-CH-FcB- LH-156 1142. CH19_0-G4xI2C6- CH-FcB-LH-156 1143. CH19_0-H5xI2C6- CH-FcB-LH-156 1144. CH19_0-B8xI2C6- CH-FcB-LH-156 1145. CH19_2-D9xI2C6- CH-FcB-LH-156 1146. CH19_8-H7xI2C6- CH-FcB-LH-156 1147. CH19_9-C2xI2C6- CH-FcB-LH-156 1148. CH19_3-D5xI2C6- CH-FcB-LH-156 1149. CH19_1- G11xI2C6-CH-FcB- LH-156 1150. CH19_1- H11xI2C6-CH-FcB- LH-156 1151. CH19_9-F3xI2C6- CH-FcB-LH-156 1152. CH19_2-G6xI2C6- CH-FcB-LH-156 1153. CH19_2-H7xI2C6- CH-FcB-LH-156 1154. CH19_5-B3xI2C6- CH-FcB-LH-156 1155. CH19_5- E10xI2C6-CH-FcB- LH-156 1156. CH19_6- G10xI2C6-CH-FcB- LH-156 1157. CH19_4-H8xI2C6- CH-FcB-LH-156 1158. CH19_2-E4xI2C6- CH-FcB-LH-156 1159. CH19_6-B8xI2C6- CH-FcB-LH-156 1160. CH19_0-B4xI2C6- CH-FcB-LH-156 1161. CH19_9-F1xI2C6- CH-FcB-LH-156 1162. CH19_4-A7xI2C6- CH-FcB-LH-156 1163. CH19_6- E12xI2C6-CH-FcB- LH-156 1164. CH19_6- C12xI2C6-CH-FcB- LH-156 1165. CH19_6-A7xI2C6- CH-FcB-LH-156 1166. CH19_6-G8xI2C6- CH-FcB-LH-156 1167. CH19_6-F9xI2C6- CH-FcB-LH-156 1168. CH19_0- C11xI2C6-CH-FcB- LH-156 1169. CH19_8-F6xI2C6- CH-FcB-LH-156 1170. CH19_0-G9xI2C6- CH-FcB-LH-156 1171. CH19_1- E11xI2C6-CH-FcB- LH-156 1172. CH19_0-F5xI2C6- CH-FcB-LH-156 1173. CH19_1-E1xI2C6- CH-FcB-LH-156 1174. CH19_1-E6xI2C6- CH-FcB-LH-156 1175. CH19_2G6_302xI2C6- CH-FcB-LH- 156 1176. CH19_2G6_302_VKGxI2C6- CH-FcB- LY-156 1177. CH19_0- E11xI2C6-CH-FcB- LY-156 1178. CH19_5-G4xI2C6- CH-FcB-LY-156 1179. CH19_8-H6xI2C6- CH-FcB-LY-156 1180. CH19_2- C11xI2C6-CH-FcB- LY-156 1181. CH19_2- A10xI2C6-CH-FcB- LY-156 1182. CH19_1- D11xI2C6-CH-FcB- LY-156 1183. CH19_9-F9xI2C6- CH-FcB-LY-156 1184. CH19_1-H8xI2C6- CH-FcB-LY-156 1185. CH19_1- B12xI2C6-CH-FcB- LY-156 1186. CH19_0-C4xI2C6- CH-FcB-LY-156 1187. CH19_3-F2xI2C6- CH-FcB-LY-156 1188. CH19_3- B10xI2C6-CH-FcB- LY-156 1189. CH19_0-G4xI2C6- CH-FcB-LY-156 1190. CH19_0-H5xI2C6- CH-FcB-LY-156 1191. CH19_0-B8xI2C6- CH-FcB-LY-156 1192. CH19_2-D9xI2C6- CH-FcB-LY-156 1193. CH19_8-H7xI2C6- CH-FcB-LY-156 1194. CH19_9-C2xI2C6- CH-FcB-LY-156 1195. CH19_3-D5xI2C6- CH-FcB-LY-156 1196. CH19_1- G11xI2C6-CH-FcB- LY-156 1197. CH19_1- H11xI2C6-CH-FcB- LY-156 1198. CH19_9-F3xI2C6- CH-FcB-LY-156 1199. CH19_2-G6xI2C6- CH-FcB-LY-156 1200. CH19_2-H7xI2C6- CH-FcB-LY-156 1201. CH19_5-B3xI2C6- CH-FcB-LY-156 1202. CH19_5- E10xI2C6-CH-FcB- LY-156 1203. CH19_6- G10xI2C6-CH-FcB- LY-156 1204. CH19_4-H8xI2C6- CH-FcB-LY-156 1205. CH19_2-E4xI2C6- CH-FcB-LY-156 1206. CH19_6-B8xI2C6- CH-FcB-LY-156 1207. CH19_0-B4xI2C6- CH-FcB-LY-156 1208. CH19_9-F1xI2C6- CH-FcB-LY-156 1209. CH19_4-A7xI2C6- CH-FcB-LY-156 1210. CH19_6- E12xI2C6-CH-FcB- LY-156 1211. CH19_6- C12xI2C6-CH-FcB- LY-156 1212. CH19_6-A7xI2C6- CH-FcB-LY-156 1213. CH19_6-G8xI2C6- CH-FcB-LY-156 1214. CH19_6-F9xI2C6- CH-FcB-LY-156 1215. CH19_0- C11xI2C6-CH-FcB- LY-156 1216. CH19_8-F6xI2C6- CH-FcB-LY-156 1217. CH19_0-G9xI2C6- CH-FcB-LY-156 1218. CH19_1- E11xI2C6-CH-FcB- LY-156 1219. CH19_0-F5xI2C6- CH-FcB-LY-156 1220. CH19_1-E1xI2C6- CH-FcB-LY-156 1221. CH19_1-E6xI2C6- CH-FcB-LY-156 1222. CH19_2G6_302xI2C6- CH-FcB-LY- 156 1223. Human Cadherin- 19 Construct A 1224. Cyno Cadherin-19 Macaca fascicularis 1225. secreted Cadherin-19 ecto- domain (amino acids 1-596) human 1226. ckCDH19(1-43):: FLAG::ckCDH 19(44-776) construct J 1227. huCDH19(1-43):: FLAG::hu(44-141):: ckCDH19(142-776) construct K 1228. ckCDH19(1-43):: FLAG::ckCDH 19(44-141) huCDH19(142-249):: ckCDH19(250-776):: construct L 1229. ckCDH19(1-43):: FLAG::ckCDH 19(44-249):: huCDH19(250-364):: ckCDH19(365-776) construct M 1230. ckCDH19(1-43):: FLAG::ckCDH 19(44-364):: huCDH19(365-463):: ckCDH19(469-776) construct N 1231. (1-43):: FLAG::ckCDH 19(44-468):: huCDH19(464-772) construct 0 1232. huCDH19(1-43):: FLAG::huCDH 19(44-772) 1233. Human CD3E extracellular domain 1234. Human CD3ε 1-27 1235. Callithrix jacchus CD3ε extracellular domain 1236. Callithrix jacchus CD3ε 1-27 1237. Saguinus oedipus CD3ε extracellular domain 1238. Saguinus oedipus CD3ε 1-27 1239. Saimiri sciureus CD3ε extracellular domain 1240. Saimiri sciureus CD3ε 1-27 

1. A bispecific antibody construct comprising a first human binding domain which binds to human CDH19 on the surface of a target cell and a second binding domain which binds to human CD3 on the surface of a T cell, wherein the first binding domain comprises a VH region comprising CDR-H1, CDR-H2 and CDR-H3 and a VL region comprising CDR-L1, CDR-L2 and CDR-L3 selected from the group consisting of: (a) CDR-H1 as depicted in SEQ ID NO: 14, CDR-H2 as depicted in SEQ ID NO: 15, CDR-H3 as depicted in SEQ ID NO: 16, CDR-L1 as depicted in SEQ ID NO: 17, CDR-L2 as depicted in SEQ ID NO: 18 and CDR-L3 as depicted in SEQ ID NO: 19; CDR-H1 as depicted in SEQ ID NO: 27, CDR-H2 as depicted in SEQ ID NO: 28, CDR-H3 as depicted in SEQ ID NO: 29, CDR-L1 as depicted in SEQ ID NO: 30, CDR-L2 as depicted in SEQ ID NO: 31 and CDR-L3 as depicted in SEQ ID NO: 32; CDR-H1 as depicted in SEQ ID NO: 40, CDR-H2 as depicted in SEQ ID NO: 41, CDR-H3 as depicted in SEQ ID NO: 42, CDR-L1 as depicted in SEQ ID NO: 43, CDR-L2 as depicted in SEQ ID NO: 44 and CDR-L3 as depicted in SEQ ID NO: 45; CDR-H1 as depicted in SEQ ID NO: 53, CDR-H2 as depicted in SEQ ID NO: 54, CDR-H3 as depicted in SEQ ID NO: 55, CDR-L1 as depicted in SEQ ID NO: 56, CDR-L2 as depicted in SEQ ID NO: 57 and CDR-L3 as depicted in SEQ ID NO: 58; CDR-H1 as depicted in SEQ ID NO: 66, CDR-H2 as depicted in SEQ ID NO: 67, CDR-H3 as depicted in SEQ ID NO: 68, CDR-L1 as depicted in SEQ ID NO: 69, CDR-L2 as depicted in SEQ ID NO: 70 and CDR-L3 as depicted in SEQ ID NO: 71; CDR-H1 as depicted in SEQ ID NO: 79, CDR-H2 as depicted in SEQ ID NO: 80, CDR-H3 as depicted in SEQ ID NO: 81, CDR-L1 as depicted in SEQ ID NO: 82, CDR-L2 as depicted in SEQ ID NO: 83 and CDR-L3 as depicted in SEQ ID NO: 84; CDR-H1 as depicted in SEQ ID NO: 92, CDR-H2 as depicted in SEQ ID NO: 93, CDR-H3 as depicted in SEQ ID NO: 94, CDR-L1 as depicted in SEQ ID NO: 95, CDR-L2 as depicted in SEQ ID NO: 96 and CDR-L3 as depicted in SEQ ID NO: 97; CDR-H1 as depicted in SEQ ID NO: 105, CDR-H2 as depicted in SEQ ID NO: 106, CDR-H3 as depicted in SEQ ID NO: 107, CDR-L1 as depicted in SEQ ID NO: 108, CDR-L2 as depicted in SEQ ID NO: 109 and CDR-L3 as depicted in SEQ ID NO: 110; CDR-H1 as depicted in SEQ ID NO: 118, CDR-H2 as depicted in SEQ ID NO: 119, CDR-H3 as depicted in SEQ ID NO: 120, CDR-L1 as depicted in SEQ ID NO: 121, CDR-L2 as depicted in SEQ ID NO: 122 and CDR-L3 as depicted in SEQ ID NO: 123; CDR-H1 as depicted in SEQ ID NO: 131, CDR-H2 as depicted in SEQ ID NO: 132, CDR-H3 as depicted in SEQ ID NO: 133, CDR-L1 as depicted in SEQ ID NO: 134, CDR-L2 as depicted in SEQ ID NO: 135 and CDR-L3 as depicted in SEQ ID NO: 136; CDR-H1 as depicted in SEQ ID NO: 144, CDR-H2 as depicted in SEQ ID NO: 145, CDR-H3 as depicted in SEQ ID NO: 146, CDR-L1 as depicted in SEQ ID NO: 147, CDR-L2 as depicted in SEQ ID NO: 148 and CDR-L3 as depicted in SEQ ID NO: 149; CDR-H1 as depicted in SEQ ID NO: 157, CDR-H2 as depicted in SEQ ID NO: 158, CDR-H3 as depicted in SEQ ID NO: 159, CDR-L1 as depicted in SEQ ID NO: 160, CDR-L2 as depicted in SEQ ID NO: 161 and CDR-L3 as depicted in SEQ ID NO: 162, CDR-H1 as depicted in SEQ ID NO: 170, CDR-H2 as depicted in SEQ ID NO: 171, CDR-H3 as depicted in SEQ ID NO: 172, CDR-L1 as depicted in SEQ ID NO: 173, CDR-L2 as depicted in SEQ ID NO: 174 and CDR-L3 as depicted in SEQ ID NO: 175; CDR-H1 as depicted in SEQ ID NO: 183, CDR-H2 as depicted in SEQ ID NO: 184, CDR-H3 as depicted in SEQ ID NO: 185, CDR-L1 as depicted in SEQ ID NO: 186, CDR-L2 as depicted in SEQ ID NO: 187 and CDR-L3 as depicted in SEQ ID NO: 188; CDR-H1 as depicted in SEQ ID NO: 196, CDR-H2 as depicted in SEQ ID NO: 197, CDR-H3 as depicted in SEQ ID NO: 198, CDR-L1 as depicted in SEQ ID NO: 199, CDR-L2 as depicted in SEQ ID NO: 200 and CDR-L3 as depicted in SEQ ID NO: 201; CDR-H1 as depicted in SEQ ID NO: 209, CDR-H2 as depicted in SEQ ID NO: 210, CDR-H3 as depicted in SEQ ID NO: 211, CDR-L1 as depicted in SEQ ID NO: 212, CDR-L2 as depicted in SEQ ID NO: 213 and CDR-L3 as depicted in SEQ ID NO: 214; CDR-H1 as depicted in SEQ ID NO: 222, CDR-H2 as depicted in SEQ ID NO: 223, CDR-H3 as depicted in SEQ ID NO: 224, CDR-L1 as depicted in SEQ ID NO: 225, CDR-L2 as depicted in SEQ ID NO: 226 and CDR-L3 as depicted in SEQ ID NO: 227; CDR-H1 as depicted in SEQ ID NO: 235, CDR-H2 as depicted in SEQ ID NO: 236, CDR-H3 as depicted in SEQ ID NO: 237, CDR-L1 as depicted in SEQ ID NO: 238, CDR-L2 as depicted in SEQ ID NO: 239 and CDR-L3 as depicted in SEQ ID NO: 240; CDR-H1 as depicted in SEQ ID NO: 248, CDR-H2 as depicted in SEQ ID NO: 249, CDR-H3 as depicted in SEQ ID NO: 250, CDR-L1 as depicted in SEQ ID NO: 251, CDR-L2 as depicted in SEQ ID NO: 252 and CDR-L3 as depicted in SEQ ID NO: 253; CDR-H1 as depicted in SEQ ID NO: 261, CDR-H2 as depicted in SEQ ID NO: 262, CDR-H3 as depicted in SEQ ID NO: 263, CDR-L1 as depicted in SEQ ID NO: 264, CDR-L2 as depicted in SEQ ID NO: 265 and CDR-L3 as depicted in SEQ ID NO: 266; CDR-H1 as depicted in SEQ ID NO: 274, CDR-H2 as depicted in SEQ ID NO: 275, CDR-H3 as depicted in SEQ ID NO: 276, CDR-L1 as depicted in SEQ ID NO: 277, CDR-L2 as depicted in SEQ ID NO: 278 and CDR-L3 as depicted in SEQ ID NO: 279; CDR-H1 as depicted in SEQ ID NO: 287, CDR-H2 as depicted in SEQ ID NO: 288, CDR-H3 as depicted in SEQ ID NO: 289, CDR-L1 as depicted in SEQ ID NO: 290, CDR-L2 as depicted in SEQ ID NO: 291 and CDR-L3 as depicted in SEQ ID NO: 292; CDR-H1 as depicted in SEQ ID NO: 300, CDR-H2 as depicted in SEQ ID NO: 301, CDR-H3 as depicted in SEQ ID NO: 302, CDR-L1 as depicted in SEQ ID NO: 303, CDR-L2 as depicted in SEQ ID NO: 304 and CDR-L3 as depicted in SEQ ID NO: 305; CDR-H1 as depicted in SEQ ID NO: 313, CDR-H2 as depicted in SEQ ID NO: 314, CDR-H3 as depicted in SEQ ID NO: 315, CDR-L1 as depicted in SEQ ID NO: 316, CDR-L2 as depicted in SEQ ID NO: 317 and CDR-L3 as depicted in SEQ ID NO: 318; CDR-H1 as depicted in SEQ ID NO: 508, CDR-H2 as depicted in SEQ ID NO: 509, CDR-H3 as depicted in SEQ ID NO: 510, CDR-L1 as depicted in SEQ ID NO: 511, CDR-L2 as depicted in SEQ ID NO: 512 and CDR-L3 as depicted in SEQ ID NO: 513; CDR-H1 as depicted in SEQ ID NO: 521, CDR-H2 as depicted in SEQ ID NO: 522, CDR-H3 as depicted in SEQ ID NO: 523, CDR-L1 as depicted in SEQ ID NO: 524, CDR-L2 as depicted in SEQ ID NO: 525 and CDR-L3 as depicted in SEQ ID NO: 526; CDR-H1 as depicted in SEQ ID NO: 534, CDR-H2 as depicted in SEQ ID NO: 535, CDR-H3 as depicted in SEQ ID NO: 536, CDR-L1 as depicted in SEQ ID NO: 537, CDR-L2 as depicted in SEQ ID NO: 538 and CDR-L3 as depicted in SEQ ID NO: 539; CDR-H1 as depicted in SEQ ID NO: 547, CDR-H2 as depicted in SEQ ID NO: 548, CDR-H3 as depicted in SEQ ID NO: 549, CDR-L1 as depicted in SEQ ID NO: 550, CDR-L2 as depicted in SEQ ID NO: 551 and CDR-L3 as depicted in SEQ ID NO: 552; CDR-H1 as depicted in SEQ ID NO: 560, CDR-H2 as depicted in SEQ ID NO: 561, CDR-H3 as depicted in SEQ ID NO: 562, CDR-L1 as depicted in SEQ ID NO: 563, CDR-L2 as depicted in SEQ ID NO: 564 and CDR-L3 as depicted in SEQ ID NO: 565; CDR-H1 as depicted in SEQ ID NO: 573, CDR-H2 as depicted in SEQ ID NO: 574, CDR-H3 as depicted in SEQ ID NO: 575, CDR-L1 as depicted in SEQ ID NO: 576, CDR-L2 as depicted in SEQ ID NO: 577 and CDR-L3 as depicted in SEQ ID NO: 578; and CDR-H1 as depicted in SEQ ID NO: 586 CDR-H2 as depicted in SEQ ID NO: 587, CDR-H3 as depicted in SEQ ID NO: 588, CDR-L1 as depicted in SEQ ID NO: 589, CDR-L2 as depicted in SEQ ID NO: 590 and CDR-L3 as depicted in SEQ ID NO: 591; and (b) CDR-H1 as depicted in SEQ ID NO: 1, CDR-H2 as depicted in SEQ ID NO: 2, CDR-H3 as depicted in SEQ ID NO: 3, CDR-L1 as depicted in SEQ ID NO: 4, CDR-L2 as depicted in SEQ ID NO: 5 and CDR-L3 as depicted in SEQ ID NO: 6; CDR-H1 as depicted in SEQ ID NO: 326, CDR-H2 as depicted in SEQ ID NO: 327, CDR-H3 as depicted in SEQ ID NO: 328, CDR-L1 as depicted in SEQ ID NO: 329, CDR-L2 as depicted in SEQ ID NO: 330 and CDR-L3 as depicted in SEQ ID NO: 331; CDR-H1 as depicted in SEQ ID NO: 339, CDR-H2 as depicted in SEQ ID NO: 340, CDR-H3 as depicted in SEQ ID NO: 341, CDR-L1 as depicted in SEQ ID NO: 342, CDR-L2 as depicted in SEQ ID NO: 343 and CDR-L3 as depicted in SEQ ID NO: 344, CDR-H1 as depicted in SEQ ID NO: 352, CDR-H2 as depicted in SEQ ID NO: 353, CDR-H3 as depicted in SEQ ID NO: 354, CDR-L1 as depicted in SEQ ID NO: 355, CDR-L2 as depicted in SEQ ID NO: 356 and CDR-L3 as depicted in SEQ ID NO: 357; CDR-H1 as depicted in SEQ ID NO: 365, CDR-H2 as depicted in SEQ ID NO: 366, CDR-H3 as depicted in SEQ ID NO: 367, CDR-L1 as depicted in SEQ ID NO: 368, CDR-L2 as depicted in SEQ ID NO: 369 and CDR-L3 as depicted in SEQ ID NO: 370; CDR-H1 as depicted in SEQ ID NO: 378, CDR-H2 as depicted in SEQ ID NO: 379, CDR-H3 as depicted in SEQ ID NO: 380, CDR-L1 as depicted in SEQ ID NO: 381, CDR-L2 as depicted in SEQ ID NO: 382 and CDR-L3 as depicted in SEQ ID NO: 383; CDR-H1 as depicted in SEQ ID NO: 391, CDR-H2 as depicted in SEQ ID NO: 392, CDR-H3 as depicted in SEQ ID NO: 393, CDR-L1 as depicted in SEQ ID NO: 394, CDR-L2 as depicted in SEQ ID NO: 395 and CDR-L3 as depicted in SEQ ID NO: 396; CDR-H1 as depicted in SEQ ID NO: 404, CDR-H2 as depicted in SEQ ID NO: 405, CDR-H3 as depicted in SEQ ID NO: 406, CDR-L1 as depicted in SEQ ID NO: 407, CDR-L2 as depicted in SEQ ID NO: 408 and CDR-L3 as depicted in SEQ ID NO: 409; CDR-H1 as depicted in SEQ ID NO: 417, CDR-H2 as depicted in SEQ ID NO: 418, CDR-H3 as depicted in SEQ ID NO: 419, CDR-L1 as depicted in SEQ ID NO: 420, CDR-L2 as depicted in SEQ ID NO: 421 and CDR-L3 as depicted in SEQ ID NO: 422; CDR-H1 as depicted in SEQ ID NO: 430, CDR-H2 as depicted in SEQ ID NO: 431, CDR-H3 as depicted in SEQ ID NO: 432, CDR-L1 as depicted in SEQ ID NO: 433, CDR-L2 as depicted in SEQ ID NO: 434 and CDR-L3 as depicted in SEQ ID NO: 435; CDR-H1 as depicted in SEQ ID NO: 443, CDR-H2 as depicted in SEQ ID NO: 444, CDR-H3 as depicted in SEQ ID NO: 445, CDR-L1 as depicted in SEQ ID NO: 446, CDR-L2 as depicted in SEQ ID NO: 447 and CDR-L3 as depicted in SEQ ID NO: 448; CDR-H1 as depicted in SEQ ID NO: 456, CDR-H2 as depicted in SEQ ID NO: 457, CDR-H3 as depicted in SEQ ID NO: 458, CDR-L1 as depicted in SEQ ID NO: 459, CDR-L2 as depicted in SEQ ID NO: 460 and CDR-L3 as depicted in SEQ ID NO: 461, CDR-H1 as depicted in SEQ ID NO: 482, CDR-H2 as depicted in SEQ ID NO: 483, CDR-H3 as depicted in SEQ ID NO: 484, CDR-L1 as depicted in SEQ ID NO: 485, CDR-L2 as depicted in SEQ ID NO: 486 and CDR-L3 as depicted in SEQ ID NO: 487; CDR-H1 as depicted in SEQ ID NO: 495, CDR-H2 as depicted in SEQ ID NO: 496, CDR-H3 as depicted in SEQ ID NO: 497, CDR-L1 as depicted in SEQ ID NO: 498, CDR-L2 as depicted in SEQ ID NO: 499 and CDR-L3 as depicted in SEQ ID NO: 500; and CDR-H1 as depicted in SEQ ID NO: 599, CDR-H2 as depicted in SEQ ID NO: 600, CDR-H3 as depicted in SEQ ID NO: 601, CDR-L1 as depicted in SEQ ID NO: 602, CDR-L2 as depicted in SEQ ID NO: 603 and CDR-L3 as depicted in SEQ ID NO:
 604. 2. The antibody construct according to claim 1, wherein the first binding domain comprises a VH region selected from the group consisting of VH regions (a) as depicted in SEQ ID NO: 21, SEQ ID NO: 34, SEQ ID NO: 47, SEQ ID NO: 60, SEQ ID NO: 73, SEQ ID NO: 86, SEQ ID NO: 99, SEQ ID NO: 112, SEQ ID NO: 125, SEQ ID NO: 138, SEQ ID NO: 151, SEQ ID NO: 164, SEQ ID NO: 177, SEQ ID NO: 190, SEQ ID NO: 203, SEQ ID NO: 216, SEQ ID NO: 229, SEQ ID NO: 242, SEQ ID NO: 255, SEQ ID NO: 268, SEQ ID NO: 281, SEQ ID NO: 294, SEQ ID NO: 307, SEQ ID NO: 320, SEQ ID NO: 515, SEQ ID NO: 528, SEQ ID NO: 541, SEQ ID NO: 554, SEQ ID NO: 567, SEQ ID NO: 580 and SEQ ID NO: 593; and (b) as depicted in SEQ ID NO: 8, SEQ ID NO: 333, SEQ ID NO: 346, SEQ ID NO: 359, SEQ ID NO: 372, SEQ ID NO: 385, SEQ ID NO: 398, SEQ ID NO: 411, SEQ ID NO: 424, SEQ ID NO: 437, SEQ ID NO: 450, SEQ ID NO: 463, SEQ ID NO: 476, SEQ ID NO: 489, SEQ ID NO: 502 and SEQ ID NO:
 606. 3. The antibody construct according to claim 1, wherein the first binding domain comprises a VL region selected from the group consisting of VL regions (a) as depicted in SEQ ID NO: 23, SEQ ID NO: 36, SEQ ID NO: 49, SEQ ID NO: 62, SEQ ID NO: 75, SEQ ID NO: 88, SEQ ID NO: 101, SEQ ID NO: 114, SEQ ID NO: 127, SEQ ID NO: 140, SEQ ID NO: 153, SEQ ID NO: 166, SEQ ID NO: 179, SEQ ID NO: 192, SEQ ID NO: 205, SEQ ID NO: 218, SEQ ID NO: 231, SEQ ID NO: 244, SEQ ID NO: 257, SEQ ID NO: 270, SEQ ID NO: 283, SEQ ID NO: 296, SEQ ID NO: 309, SEQ ID NO: 322, SEQ ID NO: 517, SEQ ID NO: 530, SEQ ID NO: 543, SEQ ID NO: 556, SEQ ID NO: 569, SEQ ID NO: 582 and SEQ ID NO: 595; and (b) as depicted in SEQ ID NO: 10, SEQ ID NO: 335, SEQ ID NO: 348, SEQ ID NO: 361, SEQ ID NO: 374, SEQ ID NO: 387, SEQ ID NO: 400, SEQ ID NO: 413, SEQ ID NO: 426, SEQ ID NO: 439, SEQ ID NO: 452, SEQ ID NO: 465, SEQ ID NO: 478, SEQ ID NO: 491, SEQ ID NO: 504 and SEQ ID NO:
 608. 4. The antibody construct according to claim 1, wherein the first binding domain comprises a VH region and a VL region selected from the group consisting of: (a) pairs of a VH region and a VL region as depicted in SEQ ID NO: 21+23, SEQ ID NO: 34+36, SEQ ID NO: 47+49, SEQ ID NO: 60+62, SEQ ID NO: 73+75, SEQ ID NO: 86+88, SEQ ID NO: 99+101, SEQ ID NO: 112+114, SEQ ID NO: 125+127, SEQ ID NO: 138+140, SEQ ID NO: 151+153, SEQ ID NO: 164+166, SEQ ID NO: 177+179, SEQ ID NO: 190+192, SEQ ID NO: 203+205, SEQ ID NO: 216+218, SEQ ID NO: 229+231, SEQ ID NO: 242+244, SEQ ID NO: 255+257, SEQ ID NO: 268+270, SEQ ID NO: 281+283, SEQ ID NO: 294+296, SEQ ID NO: 307+309, SEQ ID NO: 320+322, SEQ ID NO: 515+517, SEQ ID NO: 528+530, SEQ ID NO: 541+543, SEQ ID NO: 554+556, SEQ ID NO: 567+569, SEQ ID NO: 580+582 and SEQ ID NO: 593+595; and (b) pairs of a VH region and a VL region as depicted in SEQ ID NO: 8+10, SEQ ID NO: 333+335, SEQ ID NO: 346+348, SEQ ID NO: 359+361, SEQ ID NO: 372+374, SEQ ID NO: 385+387, SEQ ID NO: 398+400, SEQ ID NO: 411+413, SEQ ID NO: 424+426, SEQ ID NO: 437+439, SEQ ID NO: 450+452, SEQ ID NO: 463+465, SEQ ID NO: 476+478, SEQ ID NO: 489+491, SEQ ID NO: 502+504 and SEQ ID NO: 606+608.
 5. The antibody construct according to claim 1, wherein the antibody construct is in a format selected from the group consisting of (scFv)2, scFv-single domain mAb, diabodies and oligomers of the foregoing formats.
 6. The antibody construct according to claim 1, wherein the first binding domain comprises an amino acid sequence selected from the group consisting of those depicted in (a) SEQ ID NO: 25, SEQ ID NO: 38, SEQ ID NO: 51, SEQ ID NO: 64, SEQ ID NO: 77, SEQ ID NO: 90, SEQ ID NO: 103, SEQ ID NO: 116, SEQ ID NO: 129, SEQ ID NO: 142, SEQ ID NO: 155, SEQ ID NO: 168, SEQ ID NO: 181, SEQ ID NO: 194, SEQ ID NO: 207, SEQ ID NO: 220, SEQ ID NO: 233, SEQ ID NO: 246, SEQ ID NO: 259, SEQ ID NO: 272, SEQ ID NO: 285, SEQ ID NO: 298, SEQ ID NO: 311, SEQ ID NO: 324, SEQ ID NO: 519, SEQ ID NO: 532, SEQ ID NO: 545, SEQ ID NO: 558, SEQ ID NO: 571, SEQ ID NO: 584 and SEQ ID NO: 597; and (b) SEQ ID NO: 12, SEQ ID NO: 337, SEQ ID NO: 350, SEQ ID NO: 363, SEQ ID NO: 376, SEQ ID NO: 389, SEQ ID NO: 402, SEQ ID NO: 415, SEQ ID NO: 428, SEQ ID NO: 441, SEQ ID NO: 454, SEQ ID NO: 467, SEQ ID NO: 480, SEQ ID NO: 493, SEQ ID NO: 506 and SEQ ID NO:
 610. 7. The antibody construct according to claim 1, wherein the second binding domain binds to human and Callithrix jacchus, Saguinus Oedipus or Saimiri sciureus CD3 epsilon.
 8. The antibody construct according to claim 1, having the amino acid sequence selected from the group consisting of those depicted in (a) SEQ ID NO: 26, SEQ ID NO: 39, SEQ ID NO: 52, SEQ ID NO: 65, SEQ ID NO: 78, SEQ ID NO: 91, SEQ ID NO: 104, SEQ ID NO: 117, SEQ ID NO: 130, SEQ ID NO: 143, SEQ ID NO: 156, SEQ ID NO: 169, SEQ ID NO: 182, SEQ ID NO: 195, SEQ ID NO: 208, SEQ ID NO: 221, SEQ ID NO: 234, SEQ ID NO: 247, SEQ ID NO: 260, SEQ ID NO: 273, SEQ ID NO: 286, SEQ ID NO: 299, SEQ ID NO: 312, SEQ ID NO: 325, SEQ ID NO: 520, SEQ ID NO: 533, SEQ ID NO: 546, SEQ ID NO: 559, SEQ ID NO: 572, SEQ ID NO: 585, SEQ ID NO: 598, SEQ ID NOs 613-636 and 651-658, SEQ ID NOs 660-683 and 698-705, SEQ ID NOs: 707-730 and 745-752, SEQ ID NOs: 754-777 and 792-799, SEQ ID NOs: 801-824 and 839-846, SEQ ID NOs: 848-871 and 886-893, SEQ ID NOs: 895-918 and 933-940, SEQ ID NOs: 942-965 and 980-987, SEQ ID NOs: 989-1012 and 1027-1034, SEQ ID NOs: 1036-1059 and 1074-1081, SEQ ID NOs: 1083-1106 and 1121-1128, SEQ ID NOs: 1130-1153 and 1168-1175, SEQ ID NOs: 1177-1200 and 1215-1222, SEQ ID NOs: 1224-1247 and 1262-1269, SEQ ID NOs: 1271-1294 and 1309-1316, SEQ ID NOs: 1318-1341 and 1356-1363, SEQ ID NOs: 1365-1388 and 1403-1410, SEQ ID NOs: 1412-1435 and 1450-1457, SEQ ID NOs: 1459-1482 and 1497-1504, SEQ ID NOs: 1506-1529 and 1544-1551, SEQ ID NOs: 1553-1576 and 1591-1598, SEQ ID NOs: 1600-1623 and 1638-1645, SEQ ID NOs: 1647-1670 and 1685-1692, SEQ ID NOs: 1694-1717 and 1732-1739, SEQ ID NOs: 1741-1764 and 1779-1786, SEQ ID NOs: 1788-1811 and 1826-1833; and (b) SEQ ID NO: 13, SEQ ID NO: 338, SEQ ID NO: 351, SEQ ID NO: 364, SEQ ID NO: 377, SEQ ID NO: 390, SEQ ID NO: 403, SEQ ID NO: 416, SEQ ID NO: 429, SEQ ID NO: 442, SEQ ID NO: 455, SEQ ID NO: 468, SEQ ID NO: 481, SEQ ID NO: 494, SEQ ID NO: 507, SEQ ID NO: 611, SEQ ID NOs: 612 and 637-650, SEQ ID NOs: 659 and 684-697, SEQ ID NOs: 706 and 731-744, SEQ ID NOs: 753 and 778-791, SEQ ID NOs: 800 and 825-838, SEQ ID NOs: 847 and 872-885, SEQ ID NOs: 894 and 919-932, SEQ ID NOs: 941 and 966-979, SEQ ID NOs: 988 and 1013-1026, SEQ ID NOs: 1035 and 1060-1073, SEQ ID NOs: 1082 and 1107-1120, SEQ ID NOs: 1129 and 1154-1167, SEQ ID NOs: 1176 and 1201-1214, SEQ ID NOs: 1223 and 1248-1261, SEQ ID NOs: 1270 and 1295-1308, SEQ ID NOs: 1317 and 1342-1355, SEQ ID NOs: 1364 and 1389-1402, SEQ ID NOs: 1411 and 1436-1449, SEQ ID NOs: 1458 and 1483-1496, SEQ ID NOs: 1505 and 1530-1543, SEQ ID NOs: 1552 and 1577-1590, SEQ ID NOs: 1599 and 1624-1637, SEQ ID NOs: 1646 and 1671-1684, SEQ ID NOs: 1693 and 1718-1731, SEQ ID NOs: 1740 and 1765-1778, SEQ ID NOs: 1787 and 1812-1825.
 9. A polynucleotide encoding the antibody construct of claim
 1. 10. A vector comprising the polynucleotide of claim
 9. 11. A host cell transformed or transfected with the polynucleotide of claim
 9. 12. A process for producing the antibody construct of claim 1, said process comprising culturing the host cell of claim 11 under conditions allowing the expression of the antibody construct.
 13. A pharmaceutical composition comprising the antibody construct of claim
 1. 14. (canceled)
 15. A method for treating or ameliorating a melanoma disease or a metastatic melanoma disease, comprising the step of administering to a subject in need thereof the antibody construct of claim
 1. 16. The method according to claim 15, wherein the melanoma disease or metastatic melanoma disease is selected from the group consisting of superficial spreading melanoma, lentigo maligna, lentigo maligna melanoma, acral lentiginous melanoma and nodular melanoma.
 17. A kit comprising the antibody construct of claim
 1. 